Definition of the sky's the limit in US English:

the sky's the limit

phrase

informal
  • There is practically no limit (to something such as a price that can be charged or the opportunities afforded to someone).

    • ‘‘I thought Bulgaria is a country that is getting its wheels off the ground and the sky is the limit,’ he said.’
    • ‘As far as bond prices are concerned the sky is the limit.’
    • ‘At only 41 years old, I think the sky is the limit for Pawlenty.’
    • ‘When it comes to pick-up games the sky is the limit.’
    • ‘Put him in a real racing car with proper infrastructure and the sky is the limit.’
    • ‘If these guys are this good at 18, and they stay together for longer than five minutes, then - to spout another cliché - the sky is the limit!’
    • ‘In the clubby confines of America's boardrooms, the sky is the limit.’
    • ‘Really, for the tobacco firms, the sky is the limit.’
    • ‘On the other hand, this does not mean that the sky is the limit as far as prices are concerned.’
    • ‘Once an individual has this frame of mind the sky is the limit for opportunities and challenges that lie ahead.’