the act of gnawing
To bite something persistently, especially something tough.
To produce excessive anxiety or worry.
To corrode; to fret away; to waste.
An act of poking, piercing, thrusting
To attend to or supply a furnace with fuel; to act as a stoker or fireman.
To poke, pierce, thrust.
To encourage a behavior or emotion.
To feed, stir up, especially, a fire or furnace.