CLICHÉ

[noun] - a form of expression that has been so often used that its original effectiveness has been lostEvery time I ask my dad for some money, he always comes out with the old cliché, "It doesn't grow on trees, you know." [C]You should always try to avoid the use of cliché. [U]His speeches tend to be boring and cliché-ridden (= contain a lot of clichés).