1. ж. (волос) plait, tress, braid
фальшивая коса — switch
заплетать косу — plait / braid one's hair
2. ж. ( с.-х. орудие) scythe
точить, отбивать косу — whet a scythe
нашла коса на камень погов. — it's a case of diamond cut diamond; he's met his match this time
3. ж. геогр. spit ( small point of land running into sea )