Do you know what a tenter hook is?

So I had to look the meaning of today’s word prompt, tenterhooks and discovered just where the commonly used phrase, ‘on tenterhooks’ really came from. I’ve heard of the phrase and took it to mean someone was stressed to the max, ready to break at any moment and now I understand just how accurate the phrase is to the actual tenter.

A tenter is a wooden frame with bent hooks (tenter hooks) used to hold woven fabric tight while it is drying to prevent shrinkage. This website has a nice explanation and images too,