Ha-ha

·noun A sunk fence; a fence, wall, or ditch, not visible till one is close upon it.

ha
ha! ! interj. I Ha hae or hahae, an exclamation of joy, thank heavens! hahae, nunc demum mi anim...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
ha
ha! ! interj., see hahahae. ...

An Elementary Latin Dictionary
Ha
·interj An exclamation denoting surprise, joy, or grief. Both as uttered and as written, it expresse...

Webster's Dictionary of the English Language