grig Syllabification: (grig)Pronunciation: /grig/Definition of grig noun British dialect 1a small eel. 2a grasshopper or cricket. Phrases (as) merry (or lively) as a grig full of fun; extravagantly lively. Origin: Middle English (in the sense 'dwarf'): of unknown origingrig in other Oxford dictionaries Definition of grig in the British & World English dictionary