Noun
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a security pledged for the repayment of a loan
Adjective
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situated or running side by side
"collateral ridges of mountains"
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accompany, concomitant
"collateral target damage from a bombing run"
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serving to support or corroborate
"collateral evidence"
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descended from a common ancestor but through different lines
"cousins are collateral relatives"
"an indirect descendant of the Stuarts"