in advance
in advance or in advance of {adv. phr.}
1. In front; ahead (of the others); first.
In the parade, the band will march in advance of the football team.
The soldiers rode out of the fort with the scouts in advance.
2. Before doing or getting something.
The motel man told Mr. Williams he would have to pay in advance.
The paperhanger mixed his paste quite a while in advance so it would have time to cool.
It will be easier to decorate the snack bar if we cut the streamers in advance of the actual decorating.
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Source: A Dictionary of American Idioms
