Any trench, channel, or groove, as in wood or metal.
A trench cut in the soil, as when plowed in order to plant a crop.
A deep wrinkle in the skin of the face, especially on the forehead.
To cut one or more grooves in (the ground, etc.).
To wrinkle.
To pull one's brows or eyebrows together due to concentration, worry, etc.
A linear feature in rock, often structural
The way in which line breaks are inserted in a poem