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cretinize

[kreet-n-ahyz or, esp. British, kret-]
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verb (used with or without object), cre·tin·ized, cre·tin·iz·ing.
  1. to make or become cretinous; cause (a person) to be incapable of normal intelligence or sound judgment.
Also especially British, cre·tin·ise.

Origin of cretinize

First recorded in 1855–60; cretin + -ize
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018