noun
a game in which players move by hopping on one foot and then on two feet in a pattern of four squares drawn on the ground
adjective
having four equal sides and four right angles; square
adverb
in a forthright manner; boldly or bluntly
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The architect carefully measured the building's dimensions using a foursquare technique.
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Let's meet at the coffee shop on the corner of Main Street, it's right by the foursquare.
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I just unlocked the mayorship on foursquare for my favorite burger joint!
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She stood foursquare against any attempts to compromise her principles.