interjection
Used to express approval or acceptance, often in a gentle or reassuring tone.
よしよし、それでいいよ。
All right, that's fine.
よしよし、もう泣かないで。
There, there, don't cry anymore.
noun, noun or participle which takes 'suru', transitive verb
patting on the head; stroking; caressing
Children's language for the act of patting or stroking, often on the head. Can be used as a noun or with する.
See also: なでなで
子供が転んだので、よしよししてあげた。
The child fell down, so I gave them a pat on the head.