Floss your teeth once a day.

Meaning: This means to clean your teeth by passing a thin thread between their parts one time during the day.

Choice of Words: Floss means to clean something by passing a thin thread between its parts. Your means belonging to you. Teeth are the hard white things in your mouth that you use to chew food. Once means one time. A means one. Day means the time from sunrise to sunset. When you put them together, "Floss your teeth once a day" means to clean your teeth by passing a thin thread between their parts one time during the time from sunrise to sunset.

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