Chiefly South Midland and Southern U.S. between.
betwixt and between, neither the one nor the other; in a middle or unresolved position: Not wanting to side with either her father or her mother, she was betwixt and between.
Origin of betwixt
before 950; Middle English betwix, Old English betwix, betweox, equivalent to be- be- + tweox, cognate with Old High German zwiski two each; akin to German zwischen between (preposition)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Word Origin for betwixt
Old English betwix; related to Old High German zwiski two each
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Old English betweox "between, among, amidst, meanwhile," from bi- "by" (see be-) + tweox "for two," from Proto-Germanic *twa "two" + *-isk "-ish." With parasitic -t that first appeared in Old English and became general after c.1500.
Online Etymology Dictionary, © 2010 Douglas Harper