give somebody a back-cap

[Ivo]

Would you tell me whether I am right with my interpretation of the expression in bold in the following sentences?

Now I didn’t fear anyone giving me a back-cap and running me off the job. (M. Twain, “Life on the Mississippi”)

She was exposed as a liar.

She threatened to expose him.

give somebody a back-cap = expose somebody; tear someone’s mask off,

Thanks for your efforts.

[Beeesneees]

Give a back-cap is expose their past, so is not the same as 'tear someone's mask-off, which exposes their features, personality or characteristics.

In Twain's original story, the speaker has been given a job, and his explained all about his own past (he is an ex-convict) to his boss. So he is now not afraid of anyone else exposing his past to his boss.
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Cheers m' dears!