(prep.) From one to another of; mutually affecting.
Example Sentences:
(1) The article – which counts Rubio among five people who will never accept the role of vice-president to presumptive Republican nominee Donald Trump – suggests Rubio is “betwixt and between” on whether to seek re-election to the US Senate, run for governor or enter the private sector.
(2) The outpouring was triggered by a news report that cited unnamed sources “close to him” suggesting the senator was “betwixt and between” on whether to seek re-election to the Senate, run for governor or enter the private sector.
(3) Being sexually involved with an IV drug user for some years alters a person's relative position betwixt and between the drug subculture, on the one hand, and mainstream pursuits of family, work and church, on the other.