noun
a practice or agreement that limits free competition in the marketplace
preposition
the word 'of' in this phrase indicates a relationship between 'restraint' and 'trade'
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The company was accused of engaging in restraint of trade practices by limiting competition in the market.
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They were saying that the company was trying to control the market by restraining trade.
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The company was caught red-handed for messing with the trade game.
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The restriction on trade was like a heavy chain holding back the economy's growth.