English definition of “until”
/ənˈtɪl/ preposition, conjunction (also till)
A1 continuing to happen before a particular time or event and then stopping: The show will be on until the end of the month. We walked until it got dark.
A2 as far as: Carry on until the traffic lights and then turn right.
not until B1 not before a particular time or event: It doesn’t open until seven.