la·ches /ˈlæʧəz, ˈle-/
  懈怠,疏忽
  Lach·es Lache n.  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.
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