<p><strong>Noun</strong></p><ul><li>a sharp blow or smack, especially with the open hand or with something flat.</li><li>a sound made by or as if by such a blow or smack: the slap of the waves against the dock.</li><li>a sharply worded or sarcastic rebuke or comment.</li></ul><p><strong>Verb</strong></p><ul><li>(used with object) slapped, slap·ping.</li><li>to strike sharply, especially with the open hand or with something flat.</li><li>to bring (the hand, something flat, etc.) with a sharp blow against something.</li><li>to dash or cast forcibly: He slapped the package against the wall.</li><li>to put or place promptly and sometimes haphazardly (often followed by on): The officer slapped a ticket on the car. He slapped mustard on the sandwich.</li></ul><p><strong>Adverb</strong></p><ul><li>Informal. directly; straight; smack: The tug rammed slap into the side of the freighter.</li></ul><p><strong>Verb Phrase</strong></p><ul><li>to subdue, especially by a blow or by force; suppress.</li><li>to reject, oppose, or criticize sharply: to slap down dissenting voices.</li></ul>