A convenient or readily available strike, hit, or blow delivered by hand, or something easily accomplished.
Compound of 'handy' (easy to use/convenient) and 'blow' (Old English 'blaw'), likely an obsolete or dialectal term.
This word appears so rarely that it might be dialectal, archaic, or even a nonce word—it shows how English speakers can theoretically combine 'handy' with anything to mean 'easy,' even if the combination never catches on.
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