vest : Idioms & Phrases
bulletproof vest
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noun a vest capable of resisting the impact of a bullet
WordNet
life vest
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noun life preserver consisting of a sleeveless jacket of buoyant or inflatable design
life jacket; cork jacket.
WordNet
vest pocket
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noun a small pocket in a man's vest
WordNet
vested interest
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noun (law) an interest in which there is a fixed right to present or future enjoyment and that can be conveyed to another
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noun groups that seek to control a social system or activity from which they derive private benefit