ha-ha /ˈhäˌhä, , ˈhɑˌhɑ 
, ˌhäˈhä, ˌhɑˈhɑ / ▸ noun a ditch with a wall on its inner side below ground level, forming a boundary to a park or garden without interrupting the view.
– ORIGIN early 18th century : from French, said to be from the cry of surprise on suddenly encountering such an obstacle.
EnglishOxford New American Dictionary
