To make stale or trite by frequent use or repetition.
Note: As a noun, hackney means a carriage or coach for hire. As a proper noun, Hackney is an English breed of horses with high-stepping gaits. As a verbal adjective, hackneyed means banal or trite because of frequent use or repetition.
The Americans ... have invented so wide a range of pithy and hackneyed phrases that they can carry on an amusing and animated conversation without giving a moment’s reflection to what they are saying and so leave their minds free to consider the more important matters of big business and fornication.
—W. Somerset Maugham
Cakes and Ale (1930)