Home • O • Open up on (someone or something)

Open up on (someone or something)

To attack someone or something, to fire a gun or other weapon at someone or something.

The man with the gun opened up on the people on the bus.

Related Idioms

Do not halloo till you are out of the wood

The old verb ‘to halloo’ meant ‘to give a load exclamation’. Travellers lost... Read more →

A door must be either shut or open

You cannot have it shut and open at the same time. You must have one thing or the other, so make up... Read more →