A tyre of a motor vehicle that is deflated, especially one deflated because of a puncture when in use.

(of a girl or woman) Having a flat chest; having small breasts.

Alternative spelling of flatiron

Alternative form of flat out

Alternative form of flat out

(gambling, slang) A crooked gambling establishment, such as a casino running rigged or fixed (dishonest) games of chance.

Having a flat bottom.

A physical condition of the feet where the sole of the foot is in full contact with the ground, either because the arches have collapsed or because they never developed.

Having feet which are flat. / (of humans) Having the specific physical condition of flat feet. / Holding firmly and maintaining a decision; standing one's ground.

(informal) Unprepared to act.