D defs.my
Entry 2 senses Webster, 1913

By-blow

· By·-blow · IPA /ˈbʌɪbləʊ/
01 n. A side or incidental blow; an accidental blow.
  1. 1.
    A side or incidental blow; an accidental blow.
    “With their by-blows they did split the very stones in pieces.” Bunyan.
  2. 2.
    An illegitimate child; a bastard.
    “The Aga speedily . . . brought her [his disgraced slave] to court, together with her pretty by-blow, the present Padre Ottomano.” Evelyn.