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Having four equal sides and four right angles; square.
(adjective)
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Marked by firm, unwavering conviction or expression; forthright: a foursquare refusal to yield.
(adjective)
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In a forthright manner; squarely.
(adverb)
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A child's game in which each of four players stands in one of four boxes drawn on the ground in a two-by-two grid and must bounce a ball into another player's box without holding the ball or stepping out of bounds.
(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.