This is the 172nd most frequent Chinese word.
开
"Open," "start," or "turn on."
In this sentence, '开' means 'to drive' or 'to operate,' referring to the action of driving a vehicle.
我每天早上七点开车去上班。
I drive to work every morning at 7 o'clock.
Here, '开' works as part of the verb '打开,' meaning 'to open,' describing the action of opening something like a door.
老师打开了教室的门。
The teacher opened the classroom door.
In this sentence, '开' is part of the word '开设,' which means 'to establish' or 'to set up,' referring to the creation or start of something such as a course.