To take effect, to be operative.
To cause someone to become accustomed to something that requires prolonged or repeated tolerance of one or more unpleasantries.
To prepare for an activity by carrying out a practice or preparation routine.
To reach, or cause to reach, a normal operating temperature (of a car for example).
To become warmer.
To heat or reheat (e.g. food).
To do gentle exercise, stretching etc., in order to prepare the body for more vigorous exercise.
To make (an audience) enthusiastic or animated before a show