Setdown vs Rebate - What's the difference?

As a noun setdown

is the humbling of a person by act or words.

(en noun)

The humbling of a person by act or words.

A retort or a reproof that has a humbling effect.

* (humbling retort) put-down (Webster 1913)

(en noun)

A deduction from an amount to be paid; an abatement.

The return of part of an amount already paid.

(photography) The edge of a roll of film, from which no image can be developed.

A rectangular groove made to hold two pieces (of wood etc) together; a rabbet.

* '>citation

A piece of wood hafted into a long stick, and serving to beat out mortar.

An iron tool sharpened something like a chisel, and used for dressing and polishing wood.

A kind of hard freestone used in making pavements.

* (wikipedia "rebate") * * PhotoNotes.org Dictionary of Film and Digital Photography

(rebat)

To deduct or return an amount from a bill or payment

To diminish or lessen something

To beat to obtuseness; to deprive of keenness; to blunt; to turn back the point of, as a lance used for exercise.

* Shakespeare

But doth rebate and blunt his natural edge.

To cut a rebate (or rabbet) in something

To abate; to withdraw.

(Foxe)