THESAURUS
draw the line
analyze, balk at, be unwilling, begrudge, bound, condition, confine, contain, contradistinguish, copyright, demarcate, demark, differentiate, discipline, discriminate, discriminate against, distinguish, divide, grudge, hedge about, limit, mark the interface, mind, moderate, narrow, not care to, not feel like, object to, patent, pick out, qualify, red-bait, register, restrain, restrict, scant, screen, screen out, segregate, select, separate, set a limit, set apart, set off, sever, severalize, sieve, sieve out, sift, sift out, sort, sort out, specialize, split hairs, stint, straiten, subdivide, subtilize, winnow, would rather not
ROGET THESAURUS
draw the line
Discrimination
VB
discriminate, distinguish, severalize, recognize, match, identify, separate,
draw the line, sift, separate the chaff from the wheat, winnow the chaff from the wheat, separate the men from the boys, split hairs, draw a fine line, nitpick, quibble, estimate, know which is which, know what is what, know 'a hawk from a handsaw', take into account, take into consideration, give due weight to, allow due weight to, weigh carefully.