1.
rock (in rock-paper-scissors); clenched fist
The closed-fist hand shape in the game janken, which beats scissors (チョキ) and loses to paper (パー). Also refers to a clenched fist more generally.
One of the three hand shapes in じゃんけん (rock-paper-scissors), together with チョキ (scissors) and パー (paper). グー is a closed fist; it beats チョキ and loses to パー.
Common collocations
- グーを出す: to throw rock
- 手をグーにする: to clench the hand into a fist
- 最初はグー: "rock first" (the standard call that starts a game)