to apply a theory to a problem.

to apply pressure to open a door.

He applied the brakes and skidded to a stop.

Don't apply any such term to me.

He applied a portion of his salary each week to savings.

They applied the rules to new members only.

to apply one's mind to a problem;

to apply oneself to a task.

to apply paint to a wall;

to apply a bandage to a wound.

to apply a match to gunpowder.

to apply $10 to his account at the store.

The argument applies to the case.

The theory doesn't apply.

to apply for a job;

to apply for a raise.

The plastic coating is easy to apply on any surface.

This paint doesn't apply very easily.