拇指 (mǔ zhǐ): Thumb (Noun) — Meaning & Stroke Order

This is my thumb.

Has your thumb joint been experiencing unusual pain recently?

He did not give a thumbs-up; instead, he gently shook his head.

When typing on my phone, I often use my thumb to press the keys.

Although his thumb was injured, he still insisted on completing the delicate assembly work.