n. 25B6; noun
furrows in a ploughed field : GROOVE, trench, rut, trough, channel, hollow.
the furrows on either side of her mouth : WRINKLE, line, crease, crinkle, crow's foot, corrugation.
25B6; verb his brow furrowed : WRINKLE, crease, line, crinkle, pucker, screw up, scrunch up, corrugate.