furrow

This term evokes a strong image of linear indentation, whether carved into the earth or etched into skin. In agricultural contexts, it suggests productivity and preparation, while in human contexts, it typically signals mental strain, deep thought, or the passage of time. When used as a verb, the word is almost exclusively paired with the brow or forehead to describe a specific facial expression of concentration or distress. It describes a physical contraction of muscles that creates a temporary valley in the skin.