(v. t.) To put in the place of another; to substitute.

advance answer for appear for assist back up be instrumental change places with commission crowd out cut out deputize displace double for facilitate fill in for forward front for ghost ghostwrite go between mediate minister to pinch-hit pinch-hit for promote relieve replace represent serve speak for spell spell off stand in for subrogate subserve substitute for succeed supersede supplant swap places with understudy understudy for