Definition of breakaway:
(adj) :
having broken away from a larger unit
"the breakaway republic is slowly establishing order and civil society."
(n) :
(cycling) A group of riders which has gone ahead of the
peloton; a situation in the game where one or more players of a team
attack towards the goal of the other team without having any defenders in front of them
"the breakaway has maintained its lead all day and may actually survive to the finish."