against
//əˈɡenst//
Preposition
1
in opposition to; in conflict or competition with
Many people are against the new law.
2
in physical contact with and supported by; touching
She leaned against the wall.
3
in the opposite direction to; contrary to
We sailed against the wind.
4
in preparation for or as protection from
We need to save money against unexpected expenses.
5
in contrast to; as compared with
The dollar rose against the euro.
6
in exchange for or as a charge on
You can get a refund against your receipt.