grig, n. [Cf. Sw. kräk little creature, reptile; or D. kriek cricket, E. cricket.].
A cricket or grasshopper. [1913 Webster]
Heath. Audrey. [1913 Webster]
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.