Be dubious and Hang by a thread

Hang by a thread and be dubious are semantically related. In some cases you can use "Hang by a thread" instead a verb phrase "Be dubious".

Hang by a thread verb - Depend on a small thing or be at risk.

Be dubious and hang by a thread are semantically related. Sometimes you can use "Be dubious" instead a verb phrase "Hang by a thread".