One of the mysteries of the English language finally explained.
Especially of a stone: fixed in the ground.
Old English. Cognate with or formed similarly to Old Frisian erthfest, Middle Low German ērtvast, Middle Dutch ertvast (Dutch aardvast), German erdfest, Old Icelandic jarðfastr, Swedish jordfast, Old Danish, Danish jordfast from the Germanic base of earth + the Germanic base of fast.
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