“buttoned-down”在英语口语是什么意思？

字面意思：扣好扣子.
引申意思：保守，老套

素材来源：《识骨寻踪》
剧情简介：Brennan同Angela、Zach以及负责分析微粒昆虫的Hodgins在实验室的操作台上讨论眼下的案子，结果大家扯到了她书中角色的原型是不是自己的问题，闹得Brennan很晕……

【台词片段】
Angela: Who you captured perfectly…is Booth. Buttoned-down but buckets of sexual confidence which …ugh…I for one would love to tap.
Zach: It’s not right to discuss tapping asses in front of a soaker.
Bones: I can’t bounce back and forth between my book and real life. Since we are stuck with real life let’s just forget the book.
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