On your own initiative - Idioms by The Free Dictionary
on your own initiative
on (one's) own initiative
Without requiring or having been given instruction, prompting, or guidance from others; by one's own effort or energy. Few things impress employers more than implementing business solutions on your own initiative. I just think Jennifer needs to do things on her own initiative more, instead of waiting to see what her boyfriend wants to do all the time.
(do something) on your own iˈnitiative do something which is your own idea, not a suggestion or an order from another person: Did you ask him to organize a meeting, or was it on his own initiative?
References in classic literature
I will not remind you," he said, "that you came on your own initiative