The difference between Refuse and Turn down

When used as verbs, refuse means to decline (a request or demand), whereas turn down means to refuse, decline, or deny.

Refuse is also noun with the meaning: collectively, items or material that have been discarded.

Refuse is also adjective with the meaning: discarded, rejected.

check bellow for the other definitions of Refuse and Turn down

Refuse as a noun:

Collectively, items or material that have been discarded; rubbish, garbage.

Refuse as a verb (transitive):

To decline (a request or demand).

Examples:

"My request for a pay rise was refused."
Refuse as a verb (intransitive):

To decline a request or demand, forbear; to withhold permission.

Examples:

"I refuse to listen to this nonsense any more."

"I asked the star if I could have her autograph, but she refused."
Refuse as a verb (military):

To throw back, or cause to keep back (as the centre, a wing, or a flank), out of the regular alignment when troops are about to engage the enemy.

Examples:

"to refuse the right wing while the left wing attacks"
Refuse as a verb (obsolete, transitive):

To disown.

Turn down as a verb (idiomatic):

To refuse, decline, or deny.

Examples:

"He turned down all our offers of help."
Turn down as a verb (idiomatic):

To reduce the power, etc. of something by means of a control, such as the volume, heat, or light.

Examples:

"Turn down the television so I can hear myself think."

"When it starts to boil, turn down the heat to a simmer."
Turn down as a verb (idiomatic):

To reposition by turning, flipping, etc. in a downward direction.

Examples:

"Turn down the blankets to let them air out."