used
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(a) employed in accomplishing something
- "the principle of surprise is the most used and misused of all the principles of war"- H.H.Arnold & I.C.Eaker
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(s) of persons; taken advantage of
- after going out of his way to help his friend get the job he felt not appreciated but used
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(s) previously used or owned by another
- bought a secondhand (or used) car