Japanese Idiom akago no te o hineru

Japanese Idiom

赤子の手をひねるよう（あかごの　てを　ひねるよう）(Literally means: twist a baby’s hand.)

Aka go no te wo hineru you.

This Japanese Idiom means “something very easy”.

It’s like handling a baby, who is unable to fight back. It is easy to twist a baby’s hand because the baby is powerless.

この　計算問題は、簡単すぎて　赤子の　手を　ひねるようなものだ。

This math problem is too easy and it is like handling a baby.