The difference between Curb and Curtail

Curb as a noun (North America):

A concrete margin along the edge of a road; a kerb (UK)

Curb as a noun:

A raised margin along the edge of something, such as a well or the eye of a dome, as a strengthening.

Curb as a noun:

Something that checks or restrains; a restraint.

Curb as a noun:

A riding or driving bit for a horse that has rein action which amplifies the pressure in the mouth by leverage advantage placing pressure on the poll via the crown piece of the bridle and chin groove via a curb chain.

Curb as a noun (North America):

A sidewalk, covered or partially enclosed, bordering the airport terminal road system with an adjacent paved areas to permit vehicles to off-load or load passengers.

Curb as a noun:

A swelling on the back part of the hind leg of a horse, just behind the lowest part of the hock joint, generally causing lameness.

Curb as a verb (transitive):

To check, restrain or control.

Curb as a verb (transitive):

To rein in.

Curb as a verb (transitive):

To furnish with a curb, as a well; to restrain by a curb, as a bank of earth.

Curb as a verb (transitive):

To force to "bite the curb" (hit the pavement curb); see curb stomp.

Curb as a verb (transitive):

To damage vehicle wheels or tires by running into or over a pavement curb.

Curb as a verb (transitive):

To bend or curve.

Curb as a verb (intransitive):

To crouch; to cringe.

Curtail as a verb (transitive, obsolete):

To cut short the tail of an animal

Curtail as a verb (transitive):

To shorten or abridge the duration of something; to truncate.

Curtail as a verb (transitive, figuratively):

To limit or restrict, keep in check.

Curtail as a noun (architecture):

A scroll termination, as of a step, etc.