fall about

To laugh so much that one's entire body moves somewhat uncontrollably.

Japanese Meaning

笑い転げる：大笑いして身体全体が制御できずに大きく揺れる様子を表す表現です

We couldn't help but fall about when he imitated our teacher perfectly.

彼が先生の物まねを完璧にしたとき、私たちは思わず腹を抱えて笑ってしまった。

Sense（1）

To laugh so much that one's entire body moves somewhat uncontrollably.

Every time he performed the trick people would fall about laughing.

falls about

（ present singular third-person ）

falling about

（ participle present ）

fell about

（ past ）

fallen about

（ participle past ）