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.
I ate the snack I dropped on the floor, using the three-second rule.
three seconds rule (basketball)
In basketball, a violation where an offensive player stays in the key for more than three seconds.
In basketball, violating the three seconds rule results in a turnover.