bolter

n.（名詞）
A horse given to bolting.
脫韁馬
One who gives up membership in or withdraws support from a political party.
脫黨者：放棄黨籍或拒絕支持某一政黨的人

bolter
bolter 2

n.（名詞）
A machine used for sifting, especially for sifting flour.
篩粉機：用于篩粉的機器，尤用于篩選面粉
One who operates a sifting machine.
篩粉者：操作篩粉機的人