Think of a switch sitting on one small muscle. A tiny amount of Botox turns that muscle off for a few months, and everything the word covers grows out of that one picture: the muscle under the skin stops pulling, so the line above it stops folding; a muscle that keeps tightening on its own stops pulling too, so it can rest. The noun is the substance that flips the switch, and the verb is the act of putting it in.
The name is a blend of botulinum and toxin, which says plainly what it is: a poison from a bacterium, used in doses small enough to switch off one muscle instead of harming the body.
這個名字是 botulinum（肉毒桿菌）和 toxin（毒素）併起來的，等於直接說出它是什麼：細菌產生的毒素，只是用小到只夠關掉一條肌肉的份量。
Wiktionary, "Botox"
One branch
讓一條肌肉暫時停工的那個東西，以及打它的動作
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muscle-relaxing drug · noun
A drug made from a bacterial poison, which stops a muscle from pulling for a few months. Very small amounts are injected into the face to make lines in the skin look smoother, and it is also used in medicine to relax muscles that keep tightening and to help prevent some headaches.
肉毒桿菌素