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let it/things slide

to allow a situation to become slowly worse. We've really let things slide over the past few months. The accounts are in a terrible state.

See also: let, thing

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let someone/something slide

to not do anything about someone or something. She misbehaved a bit when she got here, and I let her slide because she was in a strange city. It's easy to let exercise slide when you feel bad, but that's when you need it the most.

Usage notes: often used in the form let it slide: Kids don't like practicing because of the repetition, and some coaches tend to let it slide.

See also: let