to prepare someone for a situation so that they know what to do
prime somebody with something
Did you prime her with what to say?
prime somebody for something
He had a shower and primed himself for action.
prime somebody to do something
He had been primed to say nothing about it.
to prepare a gun or bomb so that it can fire or explode
to put a special layer of paint on a surface, in order to prepare it for the next layer:
All metal surfaces will have to be primed.
to encourage a business, industry, or activity to develop by putting money or effort into it
to pour water into a water pump in order to make it ready to work