α. 1600s throughe-bearing, 1600s–1700s throw-bearing, 1600s– through-bearing, 1700s throu-beairing, 1700s throwgh-bearing, 1800s throu-bearin, 1800s through-bearin, 1800s through-bearin', 1900s– throw-bearan, 1900s– throw-bearin, 1900s– trow-baern (Shetland).
β. 1600s thorough-bearing, 1600s thorow-bearing.