the.com/barb

The small hook that turns an insult into something that stays in.

means A sharp point that catches and holds, whether on a hook, a wire, or a cutting remark.

from From Latin 'barba,' meaning beard — the word first described a beard-like tuft or whisker on a plant or fish, then narrowed to the backward-facing point on an arrow or fishhook that mimics a beard's bristly snag. The insult sense followed naturally: words with a barb catch in you the same way, and won't pull back out clean.

original meaning
beard or beard-like fringe, from latin barba
fishhook design
backward point stops the hook sliding out
wire relative
barbed wire borrows the same hooked logic
insult sense
sharp remark that catches before it stings
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