What is Laugh?

Laugh definition and meaning on Dictionary terms:
verb (used without object)
to express mirth, pleasure, derision, or nervousness with an audible, vocal expulsion of air from the lungs that can range from a loud burst of sound to a series of quiet chuckles and is usually accompanied by characteristic facial and bodily movements.
to experience the emotion so expressed: He laughed inwardly at the scene.

to produce a sound resembling human laughter: A coyote laughed in the dark.

verb (used with object)
to drive, put, bring, etc., by or with laughter (often followed by out, away, down, etc.): They laughed him out of town. We laughed away our troubles.
to utter with laughter: He laughed his consent.

the act or sound of laughing; laughter.
an expression of mirth, derision, etc., by laughing.

Informal. something that provokes laughter, amusement, or ridicule: After all the advance publicity, the prizefight turned out to be a laugh.
laughs, Informal. fun; amusement.

Verb Phrases
laugh at, to make fun of; deride; ridicule: They were laughing at him, not along with him. to be scornful of; reject: They stopped laughing at the unusual theory when it was found to be predictive. to find sympathetic amusement in; regard with humor: We can learn to laugh a little at even our most serious foibles.

laugh off, to dismiss as ridiculous, trivial, or hollow: He had received threats but laughed them off as the work of a crank.