during the period of time preceding (a particular event, date, or time)
Finish your work before lunch.
She arrived before him.
They left before sunrise.
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before lunch
before him
before sunrise
prior to
ahead of
previous to
earlier than
In front of or ahead of.
He must finish his homework before going out to play.
Please let me know before the deadline if you need an extension.
The storm hit the coast before moving inland.
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before we go
before the deadline
before it's too late
prior
earlier
ahead