to return, or to make sb return, to a normal way of thinking or behaving after a time when they have been very excited, not very practical, etc.
come back / down to earth (with a bang / bump)
to return, or to make sb return, to a normal way of thinking or behaving after a time when they have been very excited, not very practical, etc.
Definiciones del Oxford Advanced Learner's Dictionary, 9.ª edición