button-down /ˈbʌtn̩ˌdaʊn/ adjective Learner's definition of BUTTON-DOWN
always used before a noun
1
a of a collar : having the ends fastened to the shirt with buttons(领子)用纽扣系在衬衫上的 b of a shirt : having a button-down collar(衬衫)领子带领尖扣的 2
[more button-down; most button-down] often disapproving or buttoned-down /ˈbʌtn̩dˌdaʊn/ : having a very traditional and formal way of dressing, behaving, etc.(衣着、行为等)古板的,保守的