furrow

A trench cut in the soil, as when plowed in order to plant a crop.

"Don't walk across that deep furrow in the field."

Any trench, channel, or groove, as in wood or metal.

A deep wrinkle in the skin of the face, especially on the forehead.

"When she was tired, a deep furrow appeared on her forehead."

To cut one or more grooves in (the ground, etc.).

"Cart wheels can furrow roads."

To wrinkle.

To pull one's brows or eyebrows together due to concentration, worry, etc.

"As she read the document intently her brows began to furrow."