grit

Tiny, rough particles of stone or sand, often used on roads.

"The car tyres crunched on the grit."

To spread small, rough particles, like sand, on a slippery surface.

"The council gritted the icy roads."

To clench or grind one's teeth together, often due to anger.

"He gritted his teeth in frustration."

Strength of character and determination to succeed despite difficulties.

"She showed real grit to finish the race."