call in

summon to enter

• “The nurse called in the next patient”

summon to a particular activity or employment

• “Experts were called in”

pay a brief visit

• “The mayor likes to call on some of the prominent citizens”

take a player out of a game in order to exchange for another player

make a phone call

• “call in to a radio station”
• “call in sick”

demand payment of (a loan)

• “Call a loan”

cause to be returned

• “recall the defective auto tires”
• “The manufacturer tried to call back the spoilt yoghurt”

a telephone call to a radio station or a television station in which the caller participates in the on-going program