fall about
US /fɔːl əˈbaʊt/
UK /fɔːl əˈbaʊt/

1.
cair na gargalhada, morrer de rir
to laugh uncontrollably
:
•
The comedian was so funny, we were all falling about.
O comediante era tão engraçado, estávamos todos caindo de rir.
•
Every time he told that joke, people would just fall about.
Toda vez que ele contava aquela piada, as pessoas simplesmente caíam na gargalhada.