The word 'grit' refers to a person's courage and resolve; it signifies strength of character and determination in facing difficult situations. It often involves perseverance – the ability to keep going despite obstacles or challenges. Additionally, 'grit' can also refer to small, loose particles of sand or stone.
The word 'grit' comes from the Old English 'grit' or 'griþ', meaning "sand" or "gravel". The figurative sense of courage or determination likely developed from the idea of toughness or the rough quality of grit.