call in (to some place)
to telephone to some central place, such as one's place of work, as to check for messages. I have to call in to the office at noon. I will call in whenever I have a chance.
call someone in
(for something) 1. to request that someone come to have a talk. The manager called Karen in for a private meeting. The police called in Gary for questioning.
2. to request a consultation with a specialist in some field. (The person called probably will not "come in," but will work at another place.) We will have to call a heart specialist in for a consultation. We called in another specialist for an opinion.
call someone or something in
1. to call on the special talents, abilities, or power of someone or something. They had to call a new doctor in. Yes, they had to call in a specialist.
2. Go to call someone or something into something.
call something (back) in
and call something into formally request (usually by mail) that something be returned. The car company called many cars back in for repairs. They called in a lot of cars.
call in
1. Summon for help or consultation, as in We've decided to call in a specialist to look at Father. [Second half of 1600s]
2. Withdraw from circulation, as in We're calling in all the old models. [Late 1500s]
3. Communicate by telephone, as in In this office salesmen must call in once a day. [Mid-1900s]