jump up

[shootingstar]

STAGE MANAGER
.......
It's three years later. It's 1904.
It's July 7th, just after High School Commencement. That's the time most of our young people jump up and get married. Soon as they've passed their last examinations in solid geometry and Cicero's Orations, looks like they suddenly feel themselves fit to be married.
(Thornton Wilder, Our Town)
Hello all,
Please, what do you take jump up to mean in this context? Any help is much appreciated. Thanks in advance.

 

[emsr2d2]

From the rest of context, it's clear that he means that the second those young people graduate from high school, they can't wait to get married. The use of "jump up" is to suggest speed.

 

[Barque]

I more or less agree with emsr2d2's interpretation but with possibly a slightly different view. It sounds to me as if the speaker means those young people suddenly feel adult, and more "free", and decide they want to do adult things as quickly as possible.