riddle - Hello? Who is there?

Down is to the floor
Up is to expect more
Out is to suspend
Off is to pretend
Over is upside down
On is something brown

Answer

I think the answer is

Knock

Down is to the floor

Knock down = to strike to the ground

Up is to expect more

Knock up = to make a woman pregnant (expecting a child).

Out is to suspend

Knock out = to stop something working.

Off is to pretend

Knock-off = a copy or imitation, especially of an expensive product.

Over is upside down

Knock over = to turn upside-down.

On is something brown

Knock on wood

Title

Refers to knocking on a door or perhaps a Knock-knock joke