Old sayings of a cutting nature? (4)

I believe the answer is:

saws

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'old sayings' is the definition.
(I've seen this in another clue)

I don't understand the rest of the clue.

(Other definitions for saws that I've seen before include "Adages" , "Proverbs" , "bladed items" .)

I've seen this clue in the Evening Standard.

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