sit by

sit by idiom
Also, sit idly by. Refrain from interfering, remain passive, as in I can't just sit by and let her get in trouble.

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.

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