Punch line is the final part of the joke which makes you understand the meaning of the joke and that it is a joke. Example: Many dot-com businesses were so uncommercial that looking back , it is funny that people believed they might be worth investing in. Amazon was not one of those. The punchline in this joke is "Amazon was NOT one of those."

Think of a literal punch. Then think of the (final) line in a joke which delivers the same effect. :)

Punch line = funny line of a joke. You don't need examples!

punch lines are usually the final part of a joke or u can call it the the climactic phrase or statement of a joke,producing a sudden humorous effect. E.g; A man walks into a bar with a duck under his arm. The bartender asks: "Say, where did you find the pig?" "It's not a pig, it's a duck," the man answers. TO WHICH THE BARMAN REPLIES: ''I WAS TALKING TO THE DUCK'' (punch lines are in capital letters)