byfallEtymologyFrom by- + fall. Compare befall.nounA falling about; an incidental accessory or accretion; a happenstance; occurrence; instance.“The ceremonies are as it were an income or a byfall.”A fall of water, usually lesser in size, near to or beside a larger, more predominant waterfall.“There was the small byfall to which I have referred; there was the weir proper; there was a broadish lasher, the whole between them making a very fair description of tumbling bay, flanked by strong, individual streams.”