the.com/unknit
To undo what loops together held — yarn, brows, or the very fabric of things.
means To untie, unravel, or smooth out something that was knit, knotted, or tensed together.
from Old English uncnyttan, prying apart cnyttan (to knit) — the un- doing exactly what it sounds like since before sweaters were cool.
Brow businessOften means relaxing a furrowed, worried forehead.
Shakespeare's pickHe used it for both knots and frowns.
Two-way verbMeans both undoing and, oddly, joining loosely.