Webster's Revised Unabridged Dictionary · 1913

Laugh

Laugh (laf) , intransitive verb

[Old English laughen, laghen, lauhen, Anglo-Saxon hlehhan, hlihhan, hlyhhan, hliehhan; akin to Old Saxon hlahan, Dutch & German lachen, Old High German hlahhan, lahhan, lahhēn, Icelandic hlaja,W Danish lee, Swedish le, Gothic hlahjan; perh. of imitative origin.]

1.
To show mirth, satisfaction, or derision, by peculiar movement of the muscles of the face, particularly of the mouth, causing a lighting up of the face and eyes, and usually accompanied by the emission of explosive or chuckling sounds from the chest and throat; to indulge in laughter.
Queen Hecuba laughed that her eyes ran o'er. — Shakespeare
He laugheth that winneth. — Heywood's Prov
2.
Figuratively: To be or appear gay, cheerful, pleasant, mirthful, lively, or brilliant; to sparkle; to sport.
Then laughs the childish year, with flowerets crowned. — Dryden
In Folly's cup still laughs the bubble Joy. — Pope
No wit to flatter left of all his store, No fool to laugh at, which he valued more. — Pope

Laugh , transitive verb

1.
To affect or influence by means of laughter or ridicule.
Will you laugh me asleep, for I am very heavy? — Shakespeare
I shall laugh myself to death. — Shakespeare
2.
To express by, or utter with, laughter; -- with out.
From his deep chest laughs out a loud applause. — Shakespeare
Collocations (4)
To laugh away , (a) To drive away by laughter; as, to laugh away regret. (b) To waste in hilarity. Pompey doth this day laugh away his fortune. — Shakespeare
To laugh down , (a) To cause to cease or desist by laughter; as, to laugh down a speaker. (b) To cause to be given up on account of ridicule; as, to laugh down a reform.
To laugh one out of , to cause one by laughter or ridicule to abandon or give up; as, to laugh one out of a plan or purpose.
To laugh to scorn , to deride; to treat with mockery, contempt, and scorn; to despise.

Laugh , noun

An expression of mirth peculiar to the human species; the sound heard in laughing; laughter. See Laugh, v. i.
And the loud laugh that spoke the vacant mind. — Goldsmith
That man is a bad man who has not within him the power of a hearty laugh. — F. W. Robertson