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leak (v.)

"to let water in or out" [Johnson], late 14c., from Middle Dutch leken "to drip, to leak," or from Old Norse leka, both of them related to Old English leccan "to moisten, water, irrigate" (which did not survive into Middle English), all from Proto-Germanic *lek- "deficiency" (source also of Old High German lecchen "to become dry," German lechzen "to be parched with thirst"), from PIE root *leg- (2) "to dribble, trickle." The figurative meaning "come to be known in spite of efforts at concealment" dates from at least 1832; transitive sense first recorded 1859. Related: Leaked; leaking.

leak (n.)

"hole by which liquid enters or escapes," late 15c., from leak (v.) or Old Norse cognate leka. Sense of "revelation of secret information" is from 1950. Meaning "act of urination" is attested from 1934 ("Tropic of Cancer"); but the verb meaning "to piss" is from 1590s: "Why, you will allow vs ne're a Iourden [i.e. a chamberpot], and then we leake in your Chimney." ["I Hen. IV," II.i.22]

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Definitions of leak from WordNet
1
leak (n.)
an accidental hole that allows something (fluid or light etc.) to enter or escape;
one of the tires developed a leak
leak (n.)
soft watery rot in fruits and vegetables caused by fungi;
leak (n.)
a euphemism for urination;
he had to take a leak
Synonyms: wetting / making water / passing water
leak (n.)
the discharge of a fluid from some container;
he had to clean up the leak
Synonyms: escape / leakage / outflow
leak (n.)
unauthorized (especially deliberate) disclosure of confidential information;
Synonyms: news leak
2
leak (v.)
tell anonymously;
The news were leaked to the paper
leak (v.)
be leaked;
The news leaked out despite his secrecy
Synonyms: leak out
leak (v.)
enter or escape as through a hole or crack or fissure;
Gas leaked into the basement
Water leaked out of the can into the backpack
leak (v.)
have an opening that allows light or substances to enter or go out;
the roof leaks badly
The container leaked gasoline
From wordnet.princeton.edu