keep back
verb.
secure and keep for possible future use or application
The landlord retained the security deposit|I reserve the right to disagree
Synonym: hold, hold back, retain
verb.
hold back; refuse to hand over or share
The father is withholding the allowance until the son cleans his room
Synonym: withhold
verb.
prevent the action or expression of
hold back your anger|keep your cool|she struggled to restrain her impatience at the delays
Synonym: hold back, keep, restrain