in/into the swing of

:  to cause to move vigorously through a wide arc or circle

:  to cause to sway to and fro

:  to cause to turn on an axis

:  an act or instance of swinging :  swinging movement: such as

:  a stroke or blow delivered with a sweeping arm movement

:  a sweeping or rhythmic movement of the body or a bodily part

:  of or relating to musical swing

:  that may swing often decisively either way on an issue or in an election