Does anyone know what it means to stall the queue?

Question

Khali, how about you?

Answer 1

Suppose your in the express line of the supermarket, the lady in front you has more than the 10 items allowed, needs price checks on 4 of them, tries to use coupons that are expired, decides to pay by check after credit card is declined. She would be stalling the queue.

Answer 2

A quene is a bottleneck entrance, a bunch of seperate lines entering, just one line entering then would stall the quene. One sees this sort of bottleneck entrance at skilifts a lot,

Answer 3

I am guessing that in "American" English it is the same as "holding up the line".