unbrake

verb
un·​brake | \ ˌən-ˈbrāk \
unbraked; unbraking

Definition of unbrake

transitive verb

: to disengage the brake of The girl puts the tray down and unbrakes the pushchair …— Blake Morrison

First Known Use of unbrake

1875, in the meaning defined above

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The first known use of unbrake was in 1875

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