We found 2 definitions of send in from 1 different sources.
Verb |
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send in - mail in; cause to be delivered; "Send in your comments" | ||
send out, send transfer; "The spy sent the classified information off to Russia" | ||
send in - give one's name or calling card to a servant when making a formal visit | ||
call in, visit, call make a phone call; "call in to a radio station"; "call in sick" |