Vandals on WikiAnswers get blocked if they do not heedthe warning from Supervisors.
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Both versions are correct. If you say "heed this", you are using
heed as a verb. If you say "take heed", you are using heed as a
noun, which accounts for the slight variation of wording. Use the
one that sounds the best to you.
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The opposite of heed is to ignore, or to disregard.
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I heed to an oath.
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Definition of heed is: to give careful attention to