slap

To slap someone is to hit them with the palm of your open hand. It's not nice to slap your sister, no matter how mad you are.

A smack or open-handed blow is a slap, and you can also describe the sound it makes—or a similar sound—as a slap. You could describe the slap of water against the side of your rowboat, or say that your mom slaps her magazine against the table when she's done reading. Slap is also an informal adverb, meaning "immediately" or "directly:" "Sneaking out of class, he ran slap into the principal."

Definitions of slap
  1. noun
    a blow from a flat object (as an open hand)
    synonyms: smack
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    type of:
    blow, bump
    an impact (as from a collision)
  2. noun
    the act of smacking something; a blow delivered with an open hand
    synonyms: smack, smacking
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    types:
    spank
    a slap with the flat of the hand
    type of:
    blow, buffet
    a powerful stroke with the fist or a weapon
  3. verb
    hit with something flat, like a paddle or the open hand
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    types:
    cuff, whomp
    hit with the hand
    type of:
    strike
    deliver a sharp blow, as with the hand, fist, or weapon
  4. adverb
    directly
    “ran slap into her”
    synonyms: bang, bolt, slapdash, smack
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