call in (Verb) — Summon to enter. ex. "The nurse called in the next patient"
call in (Verb) — Summon to a particular activity or employment. ex. "Experts were called in"
call in (Verb) — Pay a brief visit. ex. "The mayor likes to call in on some of the prominent citizens"
call in (Verb) — Take a player out of a game in order to exchange for another player.
call in (Verb) — Make a phone call. ex. "call in to a radio station" ex. "call in sick"
call in (Verb) — Demand payment of (a loan). ex. "call in a loan"
call in (Verb) — Cause to be returned. ex. "call in the defective auto tires"
call in (Noun) — A telephone call to a radio station or a television station in which the caller participates in the on-going program.