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Region: General | Usage example: The software crash was a fly in the ointment after the smooth launch.

Fly in the ointment

Meaning

A small snag that spoils an otherwise good situation.

Usage

Used when warning to watch for minor but critical issues.

Origin & History

Origin notes can vary by region and source; this page gives the commonly reported explanation and usage context.

Old remedy stories noted insects in ointments ruined them.

Bible-based imagery that survived into general parlance.