Origin: ME lof < ODu loef, weather side (of a ship), auxiliary oar for steering, akin to ON lōfi, palm of the hand < IE base *lēp-, *lōp-, flat object, flat hand > OHG lappo, flat hand, rudder blade, Russ lopata, a shovel, rudder blade
See luff in American Heritage Dictionary 4
Origin: Middle English lof, spar holding out the windward tack of a square sail
Origin: , from Old French
Origin: , probably of Germanic origin.
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