betwinum, betweonum [OE]
bitwene [MI]
between [ME]
betɯín
https://www.etymonline.com/word/between#etymonline_v_11091
https://www.merriam-webster.com/dictionary/between#dictionary-entry-1
https://quod.lib.umich.edu/m/middle-english-dictionary/dictionary/MED4993
https://bosworthtoller.com/4108
https://bosworthtoller.com/4107
https://bosworthtoller.com/4114