Jump the queue
Definition 1 of 2
Pro Tip 1/3Social Disapproval
Using 'jump the queue' can imply someone's behavior is socially unacceptable. 
He was frowned upon for trying to jump the queue.
Pro Tip 2/3Cultural Context
In some cultures, queueing is very strict, and jumping the queue is considered very rude. 
In Britain, you're expected to wait your turn, not jump the queue.
Pro Tip 3/3Figurative Use
Can be used figuratively to describe someone gaining an unfair advantage in other areas of life. 
He was promoted quickly; some say he jumped the queue.