Be wary and Hang by a thread

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

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

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