You're right in thinking that today's word means "with crotchets," but wrong if you think those crotchets are quarter notes. Before crotchet picked up its musical designation it meant (and still does) an eccentric opinion or belief. Those with many of these?use your imagination here?are said to be crotchety. For those keeping score, crotchety old men outnumber women about 4 to 1 in usage.