Typically the line that reveals the juxtaposition itself, which is typically also the last line, or the last portion in the case of a one-liner. https://en.m.w

Typically the line that reveals the juxtaposition itself, which is typically also the last line, or the last portion in the case of a one-liner. https://en.m.wikipedia.org/wiki/Punch_line https://en.m.wikipedia.org/wiki/Punch_line Has a nice round up, though the section on the etymology of the term is a little disappointing.