English underseek

← Old English undersecan (inherited)

← German untersuchen (cognate)

← English under (prefix)

← English seek (prefix)

← Middle English underseken (inherited)

← Middle English onderseken (mention)

← Middle English undersechen (mention)

← West Frisian ûndersykje (cognate)

← Dutch onderzoeken (cognate)

→ German untersuchen (cognate)

→ Dutch onderzoeken (cognate)