By-Blow

Part of speech: noun (n.)

1. A side or incidental blow; an accidental blow. With their by-blows they did split the very stones in pieces. Bunyan.

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.