knocking copy

British  

noun

1. advertising or publicity material designed to denigrate a competing product

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Example Sentences

These exchanges, Beam writes, “were achingly serious and gloriously silly, catnip for editors who liked sprightly ‘knocking copy,’ as the British call disputatious texts.”

From Slate

This is what is known as “knocking copy” in the advertising trade and it’s something that is normally avoided.

From Forbes

This is only a general rule, not a hard and fast law: but we might take the way that Microsoft is resorting to said knocking copy here as a sign that they are worried about Chrome OS.

From Forbes

A classic example of this kind of "knocking copy" in advertising is seen in Apple's "I'm a Mac/I'm a PC" TV commercials, starring comedians David Mitchell and Robert Webb in the UK version.

From BBC

Are our newspapers, high on competitive frenzy and dishing the opposition, shrewd enough to see that coming together on survival issues is opportunity knocking – and so much better than knocking copy?

From The Guardian