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The Collaborative International Dictionary of English v.0.48 (gcide)

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
laughter.
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Queen Hecuba laughed that her eyes ran o'er. --Shak.
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He laugheth that winneth. --Heywood's
Prov.
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2. Fig.: To be or appear gay, cheerful, pleasant, mirthful,
lively, or brilliant; to sparkle; to sport.
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Then laughs the childish year, with flowerets
crowned. --Dryden.
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In Folly's cup still laughs the bubble Joy. --Pope.
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{To laugh at}, to make an object of laughter or ridicule; to
make fun of; to deride.
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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
exaltation. [Slang]
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Laughing \Laugh"ing\, a. & n.
from {Laugh}, v. i.
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{Laughing falcon} (Zool.), a South American hawk
({Herpetotheres cachinnans}); -- so called from its notes,
which resemble a shrill laugh.

{Laughing gas} (Chem.), nitrous oxide, also called
hyponitrous oxide, or protoxide of nitrogen; -- so called
from the exhilaration and laughing which it sometimes
produces when inhaled. It has been much used as an
anaesthetic agent, though now its use is primarily in
dentistry

{Laughing goose} (Zool.), the European white-fronted goose.


{Laughing gull}. (Zool.)
(a) A common European gull ({Xema ridibundus}); -- called
also {pewit}, {black cap}, {red-legged gull}, and {sea
crow}.
(b) An American gull ({Larus atricilla}). In summer the head
is nearly black, the back slate color, and the five outer
primaries black.

{Laughing hyena} (Zool.), the spotted hyena. See {Hyena}.

{Laughing jackass} (Zool.), the great brown kingfisher
({Dacelo gigas}), of Australia; -- called also {giant
kingfisher}, and {gogobera}.

{Laughing owl} (Zool.), a peculiar owl ({Sceloglaux
albifacies}) of New Zealand, said to be on the verge of
extinction. The name alludes to its notes.
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