Webster's Revised Unabridged Dictionary · 1913

Grig

Grig (grig) , noun

[Compare Swedish krak little creature, reptile; or Dutch kriek cricket, English cricket.]

1.
(a) (Zoology) A cricket or grasshopper.
(b)
(Zoology) Any small eel.
(c)
(Zoology) The broad-nosed eel. See Glut. [Provincial English]
2.
Heath. [Provincial English] — Audrey
Collocations (1)
As merry as a grig , [etymology uncertain], a saying supposed by some to be a corruption of “As merry as a Greek; ” by others, to be an allusion to the cricket.