sacrificial anode

Something that must be broken, destroyed, or otherwise damaged, to ensure that something else is preserved or protected.

problem: Your computer is almost completely broken.

solution: Get the hard drive, everything else can be a sacrificial anode.

bleating sloth

Someone that is a useful fool that does nothing, but makes a lot of noise complaining

That bleating sloth got a canary for his car, because he never changed his tyres.

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