THESAURUS
Maintain
abide, accommodate, account as, advocate, affirm, afford, afford support, allege, allege in support, announce, annunciate, answer, argue, argue for, assert, assever, asseverate, assume, aver, avouch, avow, back, back up, be afraid, bear, bear out, bear up, bide, blow to, bolster, bolster up, bottle up, brace, brook no denial, buoy up, buttress, care for, carry, carry on, champion, claim, clothe, conceive, conserve, consider, contend, contend for, continue, continue to be, contribute, copyright, cork up, correct, counter, cradle, crutch, cultivate, cushion, daresay, declare, deem, defeat time, defend, defy time, donate, dwell, emphasize, endow, endure, enunciate, espouse, esteem, estimate, exist, expect, express, extend, fancy, fight for, fill, fill up, finance, find, fund, furnish, give, give support, go on, go treat, guard, guess, have, have a hunch, have an idea, have an impression, have an inkling, have the idea, hold, hold as, hold in, hold on, hold out, hold up, husband, imagine, inhibit, insist, insist on, insist upon, invest, issue a manifesto, judge, justify, keep, keep afloat, keep alive, keep going, keep in, keep intact, keep inviolate, keep on, keep safe, keep up, last, last long, last out, lay down, lend support, lengthen, live, live on, live through, lock in, look after, look upon as, mainstay, make a plea, make available, make provision for, manage, manifesto, not destroy, not endanger, not expend, not use up, not waste, nurture, opine, patent, pay the bill, perdure, perennate, perpetuate, persist, persist in, pillow, plead for, predicate, prepare, present, preserve, press, presume, prevail, proclaim, profess, prolong, pronounce, prop, prop up, protect, protest, protract, provide, provide for, put, put it, rebut, reckon, recruit, rectify, refute, regard, register, reinforce, remain, replenish, reply, repress, respond, retain, right, riposte, run, run on, save, save up, say, say in defense, set down, set down as, set up, shore, shore up, shoulder, spare, speak, speak for, speak out, speak up, speak up for, stand, stand by, stand drinks, stand for, stand on, stand to, stand treat, stand up for, state, stay, stay on, stick to, stick up for, stock, store, stress, submit, subsidize, subsist, subvention, subventionize, supply, support, suppose, suppress, surmise, survive, suspect, sustain, take, take care of, take for, take it, take no denial, tarry, testify, think, tide over, treat, treat to, trow, underbrace, undergird, underlie, underpin, underset, upbear, uphold, upkeep, urge, urge reasons for, view as, vindicate, vouchsafe, warrant, wear, wear well, ween, yield
ROGET THESAURUS
Maintain
Preservation
VB
preserve, maintain, keep, sustain, support, hold, keep up, keep alive, refrigerate, keep on ice, not willingly let die, bank up, nurse, save, rescue, be safe, make safe, take care of, guard, stare super antiquas vias, hold one's own, hold one's ground, stand one's ground, embalm, cure, salt, pickle, season, kyanize, bottle, pot, tin, can, sterilize, pasteurize, radiate, dry, lyophilize, freeze- dry, concentrate, evaporate, freeze, quick-freeze, deep-freeze, husband.
Permanence
VB
let alone, let be, let it be, persist, remain, stay, tarry, rest, stet (copy editing) hold, hold on, last, endure, bide, abide, aby, dwell, maintain, keep, stand, stand still, stand fast, subsist, live, outlive, survive, hold one's ground, keep one's ground, hold one's footing, keep one's footing, hold good.
Continuance in action
VB
continue, persist, go on, jog on, keep on, run on, hold on, abide, keep, pursue, stick to its course, take its course, maintain its course, carry on, keep up, sustain, uphold, hold up, keep on foot, follow up, perpetuate, maintain, preserve, harp upon, keep going, keep alive, keep the pot boiling, keep up the ball, keep up the good work, die in harness, die with one's boots on, hold on the even tenor of one's way, pursue the even tenor of one's way, let be, stare super antiquas vias, quieta non movere, let things take their course, stare decisis (Jurisprudence).
Agency
VB
be in action, operate, work, act, act upon, perform, play, support, sustain, strain, maintain, take effect, quicken, strike, come play, come bring into operation, have play, have free play, bring to bear upon.
Support
VB
be supported, lie on, sit on, recline on, lean on, loll on, rest on, stand on, step on, repose on, abut on, bear on, be based on, have at one's back, bestride, bestraddle, support, bear, carry, hold, sustain, shoulder, hold up, back up, bolster up, shore up, uphold, upbear, prop, under prop, under pin, under set, riprap, bandage, give support, furnish support, afford support, supply support, lend support, give foundations, furnish foundations, afford foundations, supply foundations, lend foundations, bottom, found, base, ground, imbed, embed, maintain, keep on foot, aid.
Affirmation
VB
assert, make an assertion, have one's say, say, affirm, predicate, declare, state, protest, profess, put forth, put forward, advance, allege, propose, propound, enunciate, broach, set forth, hold out, maintain, contend, pronounce, pretend, depose, depone, aver, avow, avouch, asseverate, swear, make oath, take one's oath, make an affidavit, swear an affidavit, put in an affidavit, take one's Bible oath, kiss the book, vow, vitam impendere vero, swear till one is black in the face, swear till one is blue in the face, swear till all's blue, be sworn, call Heaven to witness, vouch, warrant, certify, assure, swear by bell book and candle, swear by, insist upon, take one's stand upon, emphasize, lay stress on, assert roundly, assert positively, lay down, lay down the law, raise one's voice, dogmatize, have the last word, rap out, repeat, reassert, reaffirm, announce, acknowledge, attest, adjure.