3. (old).—A line of business or conduct. Cf. Lurk.

[?]. [Nares], Trum. s. Why look you, colonel, he’s at old lock,

he’s at’s May-bees again.

1800. Parker, Life’s Painter, p. 116. What lock do you cut now?

1823. Grose, Vulg. Tongue, s.v.