this is where I came in


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This is where I came in.

I already know or have heard all of this before; this it not new information. When it became clear the meeting was just going to recap Monday's meeting for those who hadn't been there, Tom excused himself and muttered, "This is where I came in."
See also: came, this
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

This is where I came in.

Fig. I have heard all this before. (Said when a situation begins to seem repetitive, as when a film one has seen part of before reaches familiar scenes.) John sat through a few minutes of the argument, and when Tom and Alice kept saying the same thing over and over John said, "This is where I came in," and left the room. The speaker stood up and asked again for a new vote on the proposal. "This is where I came in," muttered Jane as she headed for the door.
See also: came, this
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.

this is where I came in

This is where I began, my knowledge dates from this point. For example, Do you have anything more to add, because if not, this is where I came in. This idiom, dating from the 1920s, originally alluded to the continuous showing of a motion picture, with customers entering the theater at any stage while the film was running and leaving when it reached the point where they had started.
See also: came, this
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

This is where I came in

sent. This all seems very familiar. This is where I came in. It’s the same thing all over again.
See also: came, this
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.
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