n.

1. 砂砾
2. 砂岩
3. 胆量

vt.

1. 咬紧（牙）
2. 咬牙切齿地说

vi.

1. 发出刺耳摩擦声

n.

1. small loose particles of stone or sand.
2. (also gritstone) a coarse sandstone.
3. courage and determination.

v.

1. spread grit on (an icy road).
2. move with or make a grating sound.