Merriam-Webster's Collegiate® Dictionary, 11th Edition
SQUASH
I. verb see: cache
Date: 1565
transitive verb to press or beat into a pulp or a flat mass ; crush , put down , suppress , intransitive verb to flatten out under pressure or impact, to proceed with a splashing or squelching sound , squeeze , press , squasher noun
II. noun
Date: 1590
something soft and easily crushed, the sudden fall of a heavy soft body or the sound of such a fall, squelch 1, a crushed mass, sweetened citrus fruit juice often served with added soda water, a singles or doubles game played in a 4-wall court with a long-handled racket and a rubber ball that can be hit off any number of walls,
III. adverb
Date: 1766
with a squash or a squashing sound,
IV. noun (plural squashes or squash)
Etymology: by shortening & alteration from earlier isquoutersquash, from Narragansett askútasquash
Date: 1634
any of various fruits of plants (genus Cucurbita ) of the gourd family widely cultivated as vegetables