From Middle English halter, helter, helfter, from Old English hælfter, hælftre, from Proto-West Germanic *halftrijā ("harness"), from Proto-Indo-European *(s)kelH- ("to cut"), equivalent to half- + -ter. Cognate with Scots helter ("halter"), Dutch halfter, halster, Low German halfter, helchter, halter, German Halfter ("halter, holster").