bobsled (n.)youdaoicibaDictYouDict[bobsled 词源字典]
1839, from bob (n.2) + sled (n.). So called because it is a short type.[bobsled etymology, bobsled origin, 英语词源]
bobsy-dieyoudaoicibaDictYouDict
"A great deal of fuss or trouble", Early 19th century: contraction of earlier Bob's-a-dying.
bobsleighyoudaoicibaDictYouDict
"A mechanically steered and braked sledge, typically for two or four people, used for racing down an ice-covered run", Mid 19th century (originally US, denoting a sleigh made of two short sleighs coupled together and used for hauling logs): from bob2 in the sense 'short' + sleigh.