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a nasty wallop
A severe and powerful blow, which may be either dealt or received. I got a really nasty wallop from a two-by-four on the construction site last week. His left hook can deal a nasty wallop if he catches you with it.
pack a punch
1. To be able to punch powerfully. For such a scrawny kid, George sure can pack a punch—even the older kids are afraid of him!
2. By extension, to have a powerful effect or impact. I don't like spicy food, so I hope this salsa doesn't pack a punch.
pack a wallopand pack a punch
Fig. to provide a burst of energy, power, or excitement. Wow, this spicy food really packs a wallop. I put a special kind of gasoline in my car because I thought it would pack a punch. It didn't.
pack a punch
Also, pack a wallop.
1. Be capable of a forceful blow; also, deliver a forceful blow. For example, Knowing Bob could pack a wicked punch, they were careful not to anger him, or She swung her handbag, really packing a wallop. [Colloquial; c. 1920]
2. Have a powerful effect, as in That vodka martini packed a wallop. Thomas Wolfe had this figurative usage in a letter (c. 1938): "I think my play, The House, will pack a punch."
pack a punchINFORMAL
COMMON If something packs a punch, it has a very powerful effect. He is known for designing clothes that really pack a punch. The advert packs a punch with its straightforward, real, no-tricks approach. Note: People also sometimes say that something packs a wallop. Many years after it was made, this movie still packs a wallop.
pack a punch1 be capable of hitting with skill or force. 2 have a powerful effect.
ˌpack a (hard, etc.) ˈpunch(informal)
1 be able to hit very hard: He’s a boxer who packs a nasty punch!
2 have a powerful effect on somebody: Their latest advertising campaign packs a hard punch. ♢ Don’t drink too much of his home-made beer — it packs quite a punch!
1. n. a hard blow. She planted a hard wallop on his right shoulder.
2. tv. to strike someone or something hard. The door swung open and walloped me in the back.
3. n. influence; pull; clout. I don’t have enough wallop to make that kind of demand.