What is the meaning of Bolster?

A large cushion or pillow, usually cylindrical in shape.

A pad, quilt, or anything used to hinder pressure, support part of the body, or make a bandage sit easy upon a wounded part; a compress.

A small spacer located on top of the axle of horse-drawn wagons that gives the front wheels enough clearance to turn.

A short, horizontal structural timber between a post and a beam for enlarging the bearing area of the post and/or reducing the span of the beam.

A beam in the middle of a railway truck, supporting the body of the car.

The perforated plate in a punching machine on which anything rests when being punched.

The part of a knife blade that abuts upon the end of the handle.

The metallic end of a pocketknife handle.

The rolls forming the ends or sides of the Ionic capital.

A block of wood on the carriage of a siege gun, upon which the breech of the gun rests when arranged for transportation.

That which supports or promotes; a catalyst.

To brace, reinforce, secure, or support.

a bur, a spiny cupule, often of a chestnut

A soft stuffed bag to lie or lean on; a cushion or pillow.

A pad; a piece of cushioning.

A supporting piece of metal.

pillow, cushion

a bolster (a large cushion or pillow)

Source: wiktionary.org