The Collaborative International Dictionary of English v.0.48:
Laugh \Laugh\ (l[aum]f), v. i. [imp. & p. p. Laughed
(l[aum]ft); p. pr. & vb. n. Laughing.] [OE. laughen,
laghen, lauhen, AS. hlehhan, hlihhan, hlyhhan, hliehhan; akin
to OS. hlahan, D. & G. lachen, OHG. hlahhan, lahhan,
lahh[=e]n, Icel. hl[ae]ja,W Dan. lee, Sw. le, Goth. 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
Queen Hecuba laughed that her eyes ran o'er. --Shak.
He laugheth that winneth. --Heywood's
2. Fig.: To be or appear gay, cheerful, pleasant, mirthful,
lively, or brilliant; to sparkle; to sport.
Then laughs the childish year, with flowerets
In Folly's cup still laughs the bubble Joy. --Pope.
To laugh at, to make an object of laughter or ridicule; to
make fun of; to deride.
No wit to flatter left of all his store,
No fool to laugh at, which he valued more. --Pope.
To laugh in the sleeve, To laugh up one's sleeve, to
laugh secretly, or so as not to be observed, especially
while apparently preserving a grave or serious demeanor
toward the person or persons laughed at.
To laugh out, to laugh in spite of some restraining
influence; to laugh aloud.
To laugh out of the other corner of the mouth or To laugh
out of the other side of the mouth, to weep or cry; to feel
regret, vexation, or disappointment after hilarity or