slap

(noun) a blow from a flat object (as an open hand). Synonyms: smack.

(noun) the act of smacking something; a blow delivered with an open hand. Synonyms: smack, smacking.

(verb) hit with something flat, like a paddle or the open hand. Examples: "The impatient teacher slapped the student." "A gunshot slapped him on the forehead."

(adv) directly. Synonyms: bang, slapdash, smack, bolt. Examples: "He ran bang into the pole." "Ran slap into her."