1. He’s leaning against the fence.

(against = on)

skateboarder
 2. The waves are crashing against the rocks.
waves

 3. The fighter in the yellow jersey has his opponent against the ropes, so he’ll probably win the fight.

fighters

 4. This Turkish flag stands out brilliantly against a deep blue sky.

(“Against” sometimes means “in contrast.”)

turkish flag

 5. She gets angry when something goes against her beliefs.

(“Go” is often used before “against” when describing disagreement.)

woman angry

 6. He protested against government spending on the military.

(“Against” is often used when someone is in opposition to something.)

protestors
 7. A building developer wants to cut down this tree and build a new Walmart, but this protester is against it.
protesting