Context: Sometimes little things pack the biggest punch. Look at those little frogs in the rain forest; you can hold them in the palm of your hand, but they contain enough ...
Top answer
NL888 Does it mean "deliver the mightiest blow"? Yes, you've got it right.
— Douglas Johnston
NL888 Does it mean "deliver the mightiest blow"?
Yes, you've got it right.
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This is an idiom. Pack basically means "has or holds" and punch means "hit with your fist." So it basically means one can hit people with one's fists with powerful strength. But here it is used as an analogy, it is saying that the little frogs can "pack the biggest punch" due to their poison.