Lag v.⁵

dial. [Cf. LAG sb.³] (See quot.)

[1570:  Levins renders lag v. by fatiscere, which it is barely possible may be meant to express the sense of this vb. along with that of LAG v.¹]

1881.  Leicestersh. Gloss., Lag, to crack or split from the centre like wood from heat or hasty drying.

1888.  in Sheffield Gloss.