| 1. | in opposition to; contrary to; adverse or hostile to: twenty votes against ten; against reason. |
| 2. | in resistance to or defense from: protection against burglars. |
| 3. | in an opposite direction to: to ride against the wind. |
| 4. | into contact or collision with; toward; upon: The rain beat against the window. |
| 5. | in contact with: to lean against the wall. |
| 6. | in preparation for; in provision for: money saved against a rainy day. |
| 7. | having as background: a design of flowers against a dark wall. |
| 8. | in exchange for; as a balance to or debit or charge on: He asked for an advance against his salary. |
| 9. | in competition with: a racehorse running against his own record time. |
| 10. | in comparison or contrast with: a matter of reason as against emotion. |
| 11. | beside; near; before: The car is against the building. |
| 12. | Archaic. before; by the time that. |
| 13. | over against, in contrast with: the rich over against the poor. |
against
In addition to the idioms beginning with against, also see beat one's head against the wall; cards are stacked against; come up against; count against; dead set against; guard against; have something against; hold something against; lift a hand against; over against; pit someone against; run against; set against; swim against; turn against; two strikes against; up against.