verb[with adverbial of direction]
Old English leccan 'to water', of West Germanic origin. The current sense dates from the mid 19th century
Do not confuse leech with leach. Leech means 'a bloodsucking worm' or 'exploit someone' (he’s leeching off the abilities of others), whereas leach means 'remove a substance from soil by the action of water' (the nutrient is quickly leached away).