Answer:

kept

AnswerCrossword Clue
KEPTHeld onto
KEPTPossessed
KEPTHung on to
KEPTSaved
KEPTRetained
KEPTWouldn't relinquish
KEPTMaintained
KEPTHeld
KEPTHeld on to
KEPTDidn't relinquish
KEPTWithheld, as secrets
KEPTPreserved
KEPTDidn't surrender
KEPTDidn't chuck
KEPTDidn't sell
KEPTDidn't spoil
KEPTContinued, with "up"
KEPTTook care of
KEPTContinued, with "on"
KEPTDidn't return
KEPTDidn't dispose of
KEPTFulfilled, as a promise
KEPTDidn't go stale
KEPTDidn't toss
KEPTRefrained (from)
KEPTStored
KEPTDidn't trash
KEPTDidn't let go of
KEPTWouldn't surrender
KEPTDidn't toss out
KEPTMaintained, as a diary
KEPTContinued
KEPTDidn't throw out
KEPTHung onto
KEPTDidn't go bad
KEPTGuarded
KEPTObserved
KEPTDidn't throw away
KEPTDidn't give away
KEPTDidn't give up