What are the origins of the words ぐう、ちょき、ぱあ in the context of じゃんけん？


Self explanatory. I've read that they stand for rock, paper and scissors, but
I can't find any ultimate origin of why these terms are what they are. Thanks!




They are derived from the onomatopoeia used to describe the motions the hand
makes when playing.

  * グー comes from [ぐっと](https://dictionary.goo.ne.jp/jn/62316/meaning/m0u/%E3%81%90%E3%81%A3%E3%81%A8/), the way you clench your fist

  * チョキ comes from [チョキン](https://dictionary.goo.ne.jp/jn/145016/meaning/m0u/%E3%83%81%E3%83%A7%E3%82%AD%E3%83%B3/) (or [チョキチョキ](https://jisho.org/search/%E3%83%81%E3%83%A7%E3%82%AD%E3%83%81%E3%83%A7%E3%82%AD)), the sound scissors make when cutting

  * パー comes from [ぱっと](https://dictionary.goo.ne.jp/jn/177736/meaning/m0u/%E3%81%B1%E3%81%A3%E3%81%A8/), the way you spread your hand

According to [Japanese
Wikipedia](https://ja.wikipedia.org/wiki/%E3%81%98%E3%82%83%E3%82%93%E3%81%91%E3%82%93#%E8%AA%9E%E6%BA%90):

>   * ぐっと拳を握るからグー
>   * チョキンと切るからチョキ
>   * ぱっと手を広げるからパー
>




They are derived from the onomatopoeia used to describe the motions the hand
makes when playing.

  * グー comes from [ぐっと](https://dictionary.goo.ne.jp/jn/62316/meaning/m0u/%E3%81%90%E3%81%A3%E3%81%A8/), the way you clench your fist

  * チョキ comes from [チョキン](https://dictionary.goo.ne.jp/jn/145016/meaning/m0u/%E3%83%81%E3%83%A7%E3%82%AD%E3%83%B3/) (or [チョキチョキ](https://jisho.org/search/%E3%83%81%E3%83%A7%E3%82%AD%E3%83%81%E3%83%A7%E3%82%AD)), the sound scissors make when cutting

  * パー comes from [ぱっと](https://dictionary.goo.ne.jp/jn/177736/meaning/m0u/%E3%81%B1%E3%81%A3%E3%81%A8/), the way you spread your hand

According to [Japanese
Wikipedia](https://ja.wikipedia.org/wiki/%E3%81%98%E3%82%83%E3%82%93%E3%81%91%E3%82%93#%E8%AA%9E%E6%BA%90):

>   * ぐっと拳を握るからグー
>   * チョキンと切るからチョキ
>   * ぱっと手を広げるからパー
>

