laugh
US /læf/
UK /læf/

1.
笑う
make the spontaneous sounds and movements of the face and body that are the instinctive expressions of lively amusement and sometimes also of derision.
:
•
She couldn't help but laugh at his joke.
彼女は彼の冗談に笑わずにはいられなかった。
•
They all started to laugh when he tripped.
彼が転んだとき、みんな笑い始めた。