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English definition of “do”

do

auxiliary verb (FOR EMPHASIS)   /du/ (present tense does  /dʌz, dəz/, past tense did  /dɪd/)
used to give extra force to the main verb : Do be careful . I did say she was a liar , but I was wrong . "Can I buy stamps here?" "Well, we do sell them, but we’re out of them right now."
(Definition of do auxiliary verb (FOR EMPHASIS) from the Cambridge Academic Content Dictionary © Cambridge University Press)
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