to go ahead (and do something): to proceed, to act (and do something)
I went ahead and ordered dinner without you. I hope you don't mind, I was very hungry.
Go ahead!: Help yourself! Please do!
(The party will) go ahead (as planned): (The party will) take place, proceed, continue (as planned)
UK: If you want to use my car, go ahead.
US: We went ahead with the project without the boss's approval.
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