gravel
noun.
rock fragments and pebbles
Synonym: crushed rock
verb.
cause annoyance in; disturb, especially by minor irritations
Mosquitoes buzzing in my ear really bothers me|It irritates me that she never closes the door after she leaves
verb.
cover with gravel
We gravelled the driveway
verb.
be a mystery or bewildering to
This beats me!|Got me--I don't know the answer!|a vexing problem|This question really stuck me