Definition of "it's on" [it's on]

• An implied conflict is starting. (phrase)

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• "Now it's on to Wimbledon, with a re-energized Federer and a revenge-minded Djoko, as well as Andy Murray, who seems too content to simply sit back and play bass."
• "Regretfully all nations are affected from time to time in some manner or form and it's on those occasions when you gratefully appreciate the support of your friends and we gratefully appreciated the support from Tonga when we were facing, or in the aftermath, of the bushfires."
• "EMDUR: ... it's on that sea phone, they're dodgy at the best of times."