A keep up with
walk/work at the same speed as
A keep up with the Joneses
compete with the neighbours in acquiring material possessions
a keep st to oneself
Don't tell anyone - it's a secret!
a keep one's fingers crossed
be thinking of sb and wishing them good luck
a hold it against sb
bear a grudge against sb for st
a hold up (e.g. about arguments)
stand up to logical examination
a hold something back
not revealing the whole truth/all the facts
a be/get held up in the traffic
delayed
a hold on
Wait! Stay at the other end of the line, please.
a f/otp/iceer