Obs. [f. BY- 2 b + SLIP sb.]
1. A casual or trivial fault.
1612. Chapman, Widows T., V. Might it not concur with your office to wink a little at a by-slip or so?
2. transf. A bastard. Cf. BY-SCAPE.
a. 1670. Hacket, Abp. Williams, II. (1692), 37. As Pope Paul the third carried himself to his ungracious by-slips (an Incubus could not have begot worse).