Meaning

noun a cooking utensil of parallel metal bars; used to grill fish or meat

noun the playing field on which football is played

originFrom Middle English gridirne, gredirne, gredyron, gredeyron, grydern, grydyryne, girdirin, girderen, variants of Middle English gredire, gredyre, itself an alteration of Middle English gridel (“griddle”). The ending was assimilated to iron, as if from grid + iron, whence grid was later derived.

Etymology from Wiktionary, CC BY-SA 3.0