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Related to send in: yes
1. To order or cause someone to enter or become involved in something. A noun or pronoun can be used between "send" and "in." Don't worry, I'm sending in our top legal adviser to handle the details. We've sent police in to keep the peace during the protest.
2. To submit or dispatch something, typically a document or payment. A noun or pronoun can be used between "send" and "in." I've sent my application in, so hopefully I'll hear back soon. The employees have sent in a letter of complaint to upper management about their working conditions. Did you send in the check for our utility bill yet?
send someone in Go to send someone into something
1. Cause to be dispatched or delivered, as in Let's send in a letter of protest to the hiring committee. [Early 1700s]
2. Cause someone to become involved in a particular undertaking, as in This disagreement is serious; it's time to send in the lawyers, or In the final few minutes the coach sent in Richard on right wing. [Mid-1800s]
1. To submit something, especially by mail or by electronic means: Let's send in a donation this year. I sent my application for college in by e-mail.
2. To order someone or some group into a place: Will you please send in the next candidate on your way out of the office? They sent me in the garage to fetch a hammer.
3. To have someone enter or reenter a contest, conflict, or situation: The coach is sending in the kicker. The president sent troops in to suppress the riots.