wallop

(noun) a forceful consequence; a strong effect. Synonyms: impact. Examples: "The book had an important impact on my thinking." "The book packs a wallop."

(noun) a severe blow.

(verb) hit hard. Synonyms: whack, wham, whop. Example: "The teacher whacked the boy."

(verb) defeat soundly and utterly. Example: "We'll wallop them!."