Laughter from the boundary? (2-2)
I believe the answer is:
ha-ha
I believe this is a double definition.
'laughter' is the first definition.
(I know that ha-ha is a type of laughter)
'boundary?' is the second definition.
(type of boundary in a garden)
'from the' is the link.
(Other definitions for ha-ha that I've seen before include "Sunken boundary wall" , "Kind of ditch with wall in it" , "Ditch with a wall in it - that's a laugh" , "Ditch with wall in it - sounds merry" , "Laugh - ditch acting as fence" .)