Hang by a thread
Meaning
Be in a precarious situation.
Usage
Describes uncertainty.
Origin & History
Origins and dates here are approximate summaries. Many idioms have disputed or unknown origins, and not every date has been checked against a historical dictionary, so treat specific dates and stories as a starting point rather than a citation.
Imagery of fragile threads supporting heavy loads.
Used since the 19th century in craftsmanship contexts.