This is the 462nd most frequent Turkish word.
harekete
"To action" or "into motion."
Here, 'harekete geçmek' is a compound phrase meaning 'to take action' and 'harekete' functions as the object of the implied motion.
Harekete geçmek için önce bir plan yapalım.
Let's create a plan first to take action.
'Harekete hazır' describes readiness for motion, with 'harekete' serving as the goal or target of the readiness.
Otomobil harekete hazır bir şekilde bekliyor.
The car is waiting in a position ready for motion.
In this sentence, 'harekete geçmek' is used to describe the activation of a mechanism, and 'harekete' again functions in the context of motion or change.