WordNet sense 1 (refrain from doing):

forbear

WordNet sense 2 (wait before acting):

wait, hold off

WordNet sense 3 (keep under control; keep in check):

keep, restrain, suppress, keep back

WordNet sense 4 (secure and keep for possible future use or application):

hold, retain

WordNet sense 5 (hold back; keep from being perceived by others):

conceal, hold in

WordNet sense 6 (hold back, as of a danger or an enemy; check the expansion or influence of):

arrest, check, contain, stop, turn back