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hasa- |hāsa| derived from sanskrit or pali root for laugh, laughter, smile

verb [intrans.]

• make the spontaneous sounds and movements of the face and body that are the instinctive expressions of lively amusement:  she couldn’t help laughing at his jokes.

• dismiss something embarrassing, unfortunate, or potentially serious by treating it in a lighthearted way or making a joke of it:  he shrugged and laughed off the mistake.

• ( be laughing) informal, in a fortunate or successful position:  we’ll be laughing when we win.

noun

• an act of laughing:  she gave a loud, silly laugh.

1. •a person who is good fun or amusing company:  I like Peter; he’s a good laugh.
   

• a source of fun or amusement:  he knew his performance was good for a laugh.

1. •(a laugh) informal, a thing that causes laughter:  that's a laugh, the idea of you getting a hole in one.