home ground

WordReference Random House Unabridged Dictionary of American English © 2026

home′ ground′, 

1. an area, locality, or subject with which one is intimately familiar:
   When you see those familiar mountains appear on the horizon, you'll know you are back on home ground. Baseball and football are home ground for this sports-loving community.

Collins Concise English Dictionary © HarperCollins Publishers::

home ground noun

1. a familiar area or topic