noun
three-second rule (food hygiene myth)
Refers to the belief that food dropped on the floor is safe to eat if picked up within three seconds. Often used humorously.
床に落としたお菓子を３秒ルールで食べた。
I ate the snack I dropped on the floor, using the three-second rule.
noun
three seconds rule (basketball)
In basketball, a violation where an offensive player stays in the key for more than three seconds.
バスケットボールでは、３秒ルールに違反すると相手ボールになる。
In basketball, violating the three seconds rule results in a turnover.