billycock

bil.ly.cock

n.Chiefly British （名词）【多用于英国】
A felt hat with a low, rounded crown, similar to a derby.
低圆顶软毡帽：一种有低圆顶的毡帽，很象圆顶礼帽

来源：
Perhaps alteration of bullycocked
可能为 bullycocked的变化
bully
bully
cock
cock