Hit up and Hang by a thread

Hit up verb - To make a request of.

Hang by a thread and hit up are semantically related. In some cases you can use "Hang by a thread" instead a verb "Hit up".

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

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