The discontinuous change of the state of an electron in an atom or molecule from one energy level to another.
A large, massive, significant change.
An abrupt, extreme change.
Used other than figuratively or idiomatically: see step, back.
To stop what one is doing and evaluate the current situation.
To prevent oneself from becoming emotionally involved in a certain situation.
to depart driving the train following the train they arrived into the station driving, so as to decrease service turnaround time.
A reversion to a former state or situation.