Thereafter

wiktionary

ref

From Middle English therafter, theraftir, þerefter, þerafter, þeræfter, from Old English þǣræfter(“after that; thereafter”), equivalent to there +‎ after. Cognate with Saterland Frisian deerätter(“thereafter”), West Frisian dêrefter(“behind that; thereafter”), Dutch daarachter(“behind that; thereafter”), German Low German daarachter(“behind that”), Danish derefter(“thereafter”), Swedish därefter(“thereafter”).

etymonline

ref

thereafter (adv.)

Old English þær æfter; see there + after. Similar formation in Dutch daarachter, Swedish derefter.