adv., prop. phr. [A prep.1 + GOOD; cf. afresh.] In good earnest; thoroughly, heartily.
a. 1536. Tindale, Prol. Jonah, Wks. I. 456. The nature of all wicked is, when they have sinned a good, to seek to drive the remembrance of sin out of their thoughts.
1591. Shaks., Two Gent., IV. iv. 190. And at that time I made her weepe a good.
1606. Holland, Sueton., 188. Ran in a good to helpe him.
1671. Welch Trav., 258, in Hazl., E. P. P., IV. 339. The company that stood about did laugh at him a-good. [Cf. mod. dial., To laugh a good one, run a good one, etc.]