a chain, strap, etc., for controlling or leading a dog or other animal; lead.
check; curb; restraint: to keep one's temper in leash; a tight leash on one's subordinates.
Hunting. a brace and a half, as of foxes or hounds.
verb (used with object)
to secure, control, or restrain by or as if by a leash: to leash water power for industrial use.
to bind together by or as if by a leash; connect; link; associate.

1250–1300; Middle English lesh, variant of lece, lese < Old French laisse. See lease1

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World English Dictionary
leash (liːʃ)
1.  a line or rope used to walk or control a dog or other animal; lead
2.  something resembling this in function: he kept a tight leash on his emotions
3.  hunting three of the same kind of animal, usually hounds, foxes, or hares
4.  straining at the leash eagerly impatient to begin something
5.  (tr) to control or secure by or as if by a leash
[C13: from Old French laisse, from laissier to loose (hence, to let a dog run on a leash), ultimately from Latin laxuslax]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

"thong for holding a dog or hound," c.1300, from O.Fr. laisse, from laissier "loosen," from L. laxare, from laxus "loose" (see lax). Fig. senses are attested from c.1430. The verb is from 1599. The noun meaning "a set of three" is from c.1320, originally in sporting language.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Sometimes they are made into pets and walked on a leash.
He spins and gets the leash in his mouth, and sinks to the ground to avoid
At last the leash has been cut and the dogs of political war have left their
Not only did that deter potential recruits, it also meant that the commission's
  budget is now on a much tighter leash.
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