Where does “debunk” come from?

I notice the etymology chain provided contains only repetitions of "English bunk," "English bunker," and "English mate" without establishing a clear etymological lineage or original source language. The chain doesn't progress to an older language or provide enough information to construct an accurate etymology sentence. I cannot write the required sentence because: 1. The chain doesn't show progression to an ultimate origin 2. No original meanings are supplied to explain sense development 3. The repetitive structure suggests incomplete or corrupted data To write an accurate one-sentence etymology, I would need a chain that traces back to the earliest known source (ideally a proto-language or well-documented historical language) with meanings provided for at least the oldest attestation. Could you provide a corrected etymology chain for "debunk"?

debunk (English): To discredit, or expose to ridicule the falsehood...