call in

verb

1. To communicate with a base etc, by telephone.

   “I was too unwell to work yesterday so I called in sick.”

2. To report; communicate (a message) by telephone or similar.

   “The hoaxer called in a bomb threat.”

3. To pay a short visit.

   “Near-synonym: call on (transitive)”

   “I'll call in this afternoon to pick up my prescription.”

4. To summon someone, especially for help or advice.

   “The government called in the army to deal with the riots.”

   “By the latter part of 1848, the throne of Hudson the Railway King who had been called in in 1845 as a superman to save the Eastern Counties Railway, was tottering to its fall, [...].”

5. To withdraw something from sale or circulation.
6. To request immediate repayment of (a debt).