What is the meaning of Hackney?

An ordinary horse.

A carriage for hire or a cab.

A horse used to ride or drive.

A breed of English horse.

A hired drudge; a hireling; a prostitute.

Inferior writing; literary hackwork.

Offered for hire.

Much used; trite; mean.

To make uninteresting or trite by frequent use.

To use as a hackney.

To carry in a hackney coach.

Source: wiktionary.org