D defs.my
Entry 1 sense Webster, 1913

Ha-ha

/(hä*hä")/ · IPA /ˈhɑˌhɑ/
01 n. A sunk fence; a fence, wall, or ditch, not visible till one is close upon it.
  1. 1.
    A sunk fence; a fence, wall, or ditch, not visible till one is close upon it.