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To interrogate, scrutinize, or question someone intensely or thoroughly. My boyfriend is so controlling, always giving me the third degree if I go anywhere or see anyone without him. The police gave me the third degree regarding my whereabouts during the crime. Mom, don't give her the third degree. I know she was at the library—I saw her there.

To talk with one, perhaps to issue a warning or reprimand. A: "Aunt Karen let me have ice cream for dinner!" B: "Is that so? Karen, may I have a word with you?" I just had a word with Stu and he said he'll join us tonight. A: "Bill, can I have a word with you when you have a moment?" B: "Uh oh, that doesn't sound good."