THESAURUS
enter upon
accept, assume, attack, attempt, buckle to, come out, dive into, embark in, embark on, embark upon, endeavor, engage in, enter, enter on, fall into, fall to, get busy, get cracking, get going, get under way, get with it, go about, go at, go in for, go into, go to it, go upon, have at, hop to it, jump to it, launch forth, launch into, lay about, light into, move into, pitch in, pitch into, plunge into, proceed to, sail into, set about, set at, set forward, set going, set to, set to work, start in, tackle, take on, take up, turn to, undertake, venture upon, wade into
ROGET THESAURUS
enter upon
Beginning
VB
begin, start, commence, conceive, open, dawn, set in, take its rise,
enter upon, enter, set out, embark in, incept, initiate, launch, inaugurate, inchoate, rise, arise, originate, usher in, lead off, lead the way, take the lead, take the initiative, head, stand at the head, stand first, stand for, lay the foundations, found, set up, set on foot, agoing, set abroach, set the ball in motion, apply the match to a train, broach, open up, open the door to, get underway, set about, get to work, set to work, set to, make a beginning, make a start, handsel, take the first step, lay the first stone, cut the first turf, break ground, break the ice, break cover, pass the Rubicon, cross the Rubicon, open fire, open the ball, ventilate, air, undertake, come into existence, come into the world, make one's debut, take birth, burst forth, break out, spring up, spring forth, crop up, pop up, appear, materialize, begin at the beginning, begin ab ovo, begin again, begin de novo, start afresh, make a fresh start, take it from the top, shuffle the cards, reshuffle the cards, resume, recommence.