come in and warm, come into the fire verb phrase To come into the house and get warm (expressions of mountain hospitality).
1935 Sheppard Cabins in Laurel 156 He greets you with “Light and hitch!” or “Come in and warm,” or “Set down and cool off,” and urges you to stay for dinner. 1939 Hall Coll. Cades Cove TN Come into the fire if you’uns wants to. (John Burchfield)
It didn’t appear we were going to have enough winter to actually ask somebody to come in and warm this winter until this week. Since the north wind started blowing sometime over the weekend we’ve all been sitting by the woodstove and enjoying every minute of it.