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Forward and backward in trepidation (4)

Ross

I believe the answer is:

pert

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'forward' is the definition.
(both can mean cheeky or disrespectful)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for pert that I've seen before include "Saucy and impudent" , "Impudent, cheeky" , "Saucy and chipper" , "Irreverent or saucy" , "It's fresh" .)

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