Old English cyst

← Proto-Germanic *kustiz (inherited)

← Proto-Germanic *kustuz (mention)

← Old High German chust (cognate)

← Proto-Indo-European *ǵews- (root)

← Proto-Indo-European *ǵéwstus (inherited)

← Dutch kust (cognate)

← Old Norse kostr (cognate)

← Old Saxon cust (cognate)

→ English cost (cognate)

→ Old English cost (cognate)

→ Old English costian (cognate)

→ Old English cystan (affix)

→ Old English cystig (suffix)