verbStrong class 2to grieve, to feel sorrowto cause regret, to rueOf uncertain origin. Appears to trace back to a Proto-Indo-European *krew (H)-, with no secure extra-Germanic cognates. Theories include connections to Proto-Indo-European *krewh₂- (‘blood’), as well as to *krows- (‘to fall, beat, break, bruise’). In the latter case, cognate with Lithuanian krùšti (‘to smash, crash, bruise’), Russian круши́ть (krušítʹ, ‘to destroy’), Russian сокруша́ться (sokrušátʹsja) (note the same sense evolution, also compare Czech truchlit from Proto-Slavic *truxlъ).