<p><strong>Verb (used with object)</strong></p><ul><li>to draw into the mouth by producing a partial vacuum by action of the lips and tongue: to suck lemonade through a straw.</li><li>to draw (water, moisture, air, etc.) by or as if by suction: Plants suck moisture from the earth.</li><li>The pump sucked water from the basement.</li><li>to apply the lips or mouth to and draw upon by producing a partial vacuum, especially for extracting fluid contents: to suck an orange.</li><li>to put into the mouth and draw upon: to suck one's thumb.</li><li>to take into the mouth and dissolve by the action of the tongue, saliva, etc.: to suck a piece of candy.</li><li>to render or bring to a specified condition by or as if by sucking.</li><li>Slang: Vulgar. to perform fellatio on (sometimes followed by off).</li></ul><p><strong>Verb (used without object)</strong></p><ul><li>to draw something in by producing a partial vacuum in the mouth, especially to draw milk from the breast.</li><li>to draw or be drawn by or as if by suction.</li><li>(of a pump) to draw air instead of water, as when the water is low or a valve is defective.</li><li>Slang: to be repellent or unpleasant: Poverty sucks.</li><li>Slang: to be inferior, as in quality or execution; be poor: Everyone says the show sucks. She sucks at tennis.</li><li>Slang: to behave in a fawning manner (usually followed by around).</li></ul><p><strong>Noun</strong></p><ul><li>an act or instance of sucking.</li><li>a sucking force.</li><li>the sound produced by sucking.</li><li>that which is sucked; nourishment drawn from the breast.</li><li>a small drink; sip.</li><li>a whirlpool.</li></ul><p><strong>Verb phrase</strong></p><ul><li>Slang: to deceive; cheat; defraud: The confidence man sucked us all in.</li><li>Slang: to be obsequious; toady: The workers are all sucking up to him because he's the one who decides who'll get the bonuses.</li></ul>