off like a bride's nightie

Adjective

Australia not-comparable slang

(Australia, slang, simile) Making a rapid departure; away. / (Australia, horse racing) Moving quickly and resolutely.

Japanese Meaning

（オーストラリアのスラング）すぐに、あるいは急いで立ち去ること。 / （オーストラリアの競馬用語）迅速かつ決然と動くこと。

When the manager yelled 'Fire!', the staff were off like a bride's nightie, abandoning their desks within seconds.

マネージャーが「火事だ！」と叫ぶと、スタッフは一斉に逃げ出し、数秒で机を離れた。

Sense（1）

(Australia, slang, simile) Making a rapid departure; away.

Sense（2）

(Australia, horse racing) Moving quickly and resolutely.