act a part ( synonym found)
Definition of act a part:

(n) : something that actuates something else, especially a mechanism that causes a device to be switched on or off; the mechanism that moves the head assembly on a disk drive
"the mind is the actuator of the body"
Definition of act a part:

(n) : something that actuates something else, especially a mechanism that causes a device to be switched on or off; the mechanism that moves the head assembly on a disk drive
"the mind is the actuator of the body"
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