By-blow

By"-blow` (?), 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.