The word 'lock down' in basketball is used when someone cant get past someone else without getting the balltapped
Michael Jordan - Hey scott, why cant rich ever beat u
scott - cos i got him on 'lock down'
rich - i wish i could get the ball past scott, he is so good
2) When a person that is a threat walks into the school, Lock Down will happen. Lock down is when everyone goes to the nearest classroom, if not in one, lock their doors and hide in a corner away from windows.