underseek

The story

1. Old English · inherited fromundersēcan“to investigate, examine”
2. Middle English · inherited fromunderseken
3. English todayunderseek

From Middle English underseken, onderseken (also undersechen), from Old English undersēcan (“to investigate, examine”), equivalent to under- + seek. Cognate with West Frisian ûndersykje (“to research”), Dutch onderzoeken (“to investigate, probe, examine”), German untersuchen (“to examine, investigate, explore”).