out like a light

Adjective

colloquial not-comparable

(simile, colloquial) Asleep or unconscious, particularly if this has occurred suddenly and the sleep is deep.

Japanese Meaning

（比喩的かつ口語的に）突然、深く眠りにつく、または急に意識を失う状態を指す表現。 / 例）夜中に急に寝てしまう、あるいは酔って意識を失う様子を表す。

After the long hike, Maria was out like a light and missed the movie.

長いハイキングの後、マリアはぐっすり眠っていて映画を見逃した。

Sense（1）

(simile, colloquial) Asleep or unconscious, particularly if this has occurred suddenly and the sleep is deep.

Once she received anesthesia, she was out like a light.