Describe a situation where broad match negative keywords would unintentionally block desired traffic, and how to mitigate this.

A situation where broad match negative keywords would unintentionally block desired traffic occurs when the negative keyword contains a word or phrase that is also a component of a relevant, intended keyword. Broad match negative keywords prevent ads from showing for searches that contain *allthe words in the negative keyword phrase, in any order. For example, if you sell 'blue widgets' and add 'blue reviews' as a broad match negative keyword, you might unintentionally block searches for 'buy blue widgets' or 'cheap blue widgets' ....