noun
A wrinkle or crease on a surface, typically on skin or fabric.
verb
To gather or contract into wrinkles or small folds.
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She couldn't help but pucker her lips when tasting the sour lemon.
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Whenever he eats something sour, he always makes a funny pucker face.
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I hate how my lips pucker up when I eat something tart.
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The thought of having to give a speech made her stomach pucker with nerves.