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+1 on the links posted by BeBerlin..

Slicing a leather belt will take the edge back a notch or
two.:cry:

You need to strop it correctly and that takes practice.

Between the above line and...

Sounds like it is not "shave ready".

I am tempted to say strop on a rolled
up newspaper rather than a brown belt.

If stropping does not bring it back to life
send it out to a professional.