親指

1. Origins, structure, and basic meaning

• Structure: Written 親指 and read おやゆび, it denotes the thumb, the opposable digit of the hand.
• Basic usage: It is used for pressing clay and for the thumb section of a glove.

2. Common pitfalls and similar expressions

• Feet require clarification
  • The bare term normally means the hand; a big toe is specified as the foot's counterpart.