gravel

(noun) rock fragments and pebbles. Synonyms: crushed rock.

(verb) cause annoyance in; disturb, especially by minor irritations. Synonyms: annoy, rag, get to, bother, get at, irritate, rile, nark, nettle, vex, chafe, devil. Examples: "Mosquitoes buzzing in my ear really bothers me." "It irritates me that she never closes the door after she leaves."

(verb) cover with gravel. Examples: "We gravelled the driveway."

(verb) be a mystery or bewildering to. Synonyms: perplex, vex, stick, get, puzzle, mystify, baffle, beat, pose, bewilder, flummox, stupefy, nonplus, amaze, dumbfound. Examples: "This beats me!." "Got me--i don't know the answer!." "A vexing problem." "This question really stuck me."