To RETAIN something means to keep that something!
The homonym for keep is "key."
keep
Retain.
Retain means to keep something.
Some words that end with the suffix 'tain' are:abstainattaincaptaincontainmaintainobtainpertainretainsustainstain
The opposite of retain (keep) could be lose or dispose of. The opposite of retain (hold) would be release, free, loosen, or unsecure.
She tried to retain her composure during the meeting, but her frustration was evident.
That is the correct spelling of "keep" (retain, hold, or a castle's center).
To continue to hold; to keep in possession; not to lose, part with, or dismiss; to retrain from departure, escape, or the like., To keep in pay; to employ by a preliminary fee paid; to hire; to engage; as, to retain a counselor., To restrain; to prevent., To belong; to pertain., To keep; to continue; to remain.
Retain.
Restore, Keep, Retain, Validate