Merriam-Webster's Collegiate® Dictionary, 11th Edition
MOW
I. noun
Etymology: Middle English, heap, stack, from Old English mūga; akin to Old Norse mūgi heap Date: before 12th century a piled-up stack (as of hay or fodder), the part of a barn where hay or straw is stored,
II. verb (mowed; mowed or mown; mowing)
Etymology: Middle English, from Old English māwan; akin to Old High German māen to mow, Latin metere to reap, mow, Greek aman Date: before 12th century transitive verb
1. to cut down with a scythe or sickle or machine, to cut the standing herbage (as grass) of,
2. a. to kill or destroy in great numbers or mercilessly , to cause to fall ; knock down , to overcome swiftly and decisively ; rout , intransitive verb to cut down standing herbage (as grass), mower noun
III. noun
Etymology: Middle English mowe, from Anglo-French mouwe, of Germanic origin; akin to Middle Dutch mouwe protruding lip
Date: 14th century
grimace ,
IV. intransitive verb
Date: 15th century
to make grimaces