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By-blow

//ˈbʌɪbləʊ// noun, slang

Noun

1
A blow struck to the side or from the side, as in swordplay; a secondary or incidental strike of any sort.
"Either commander took speedy advantage of it—Hopton to make a swift diversion into Sussex and capture Arundel Castle (which was but a by-blow, for in a few weeks he had lost it again)."
2
the illegitimate offspring of unmarried parents wordnet
3
An illegitimate child; a child of an unknown or unmarried father. slang
"‘Nay,’ said the landlady, ‘if I thought he was a gentleman's son, thof he was a bye-blow, I should behave to him in another guess manner; for many of these bye-blows come to be great men, and, as my poor first husband used to say, never affront any customer that's a gentleman.’"

From by- + blow.

Unscramble this word: byblow