retain
1 absorb, contain, detain, grasp, grip, hang or hold onto, hold, hold back, hold fast, keep, keep possession of, maintain, preserve, reserve, restrain, save
2 bear in mind, impress on the memory, keep in mind, memorize, recall, recollect, remember
3 commission, employ, engage, hire, pay, reserve
Antonyms
1 let go, lose, release, use up