sniff [ˈsnɪf]

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¹ sniff verb

• to take air into your nose in short breaths that are loud enough to be heard
• to smell (something or someone) by putting your nose close to it and taking air in through your nose in short breaths —often + at
• to take (something, such as fumes or a drug) into your body by inhaling it through your nose in order to get intoxicated

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² sniff noun

• an act or the sound of drawing air into the nose especially in order to smell something or because you are sick or have been crying
• an expression of dislike or disapproval
• a small amount or sign of something