on thin ice

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Suggesting a person skating or walking on the ice, at risk of breaking through and falling in the water.

Prepositional phrase[edit]

on thin ice

  1. (idiomatic) In a dangerous, hazardous, or delicate situation; at risk.
    Ever since he was caught stealing office supplies, he has been on thin ice with his boss.

Usage notes[edit]

  • Also used as adverb.


See also[edit]