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Webster 1913 Edition
Lache
{ 
Lach′es
(lăsh′ĕz)
, Lache
(lăsh)
, } Noun.
 (Law) 
Neglect; negligence; remissness; neglect to do a thing at the proper time; especially, a delay in asserting a claim, sufficient to cause a person to lose the right to adjuducation of the claim by a court. 
It ill became him to take advantage of such a 
laches 
with the eagerness of a shrewd attorney. Macaulay.