expression, noun
mine (ours) for the taking; something under one's full control
An idiomatic expression used when one is confident of obtaining or controlling something, often in competitive or advantageous situations.
この試合はもうこっちの物だ。
This game is as good as ours now.
彼が味方につけば、計画はこっちの物だ。
If we get him on our side, the plan is under our control.