不少同性恋在出柜（对外坦白自己的同性恋身份）之前，都会找一个异性朋友假装是自己的恋人，以此掩饰自己真实的性取向，这样的假恋人就被称为他的“步入式衣橱”。

A “walk-in closet” refers to a woman who is beard or disquise for a gay man that has not come out.

“步入式衣橱”指充当未出柜的男同性恋的假恋人、帮他掩饰身份的女人。

Example:

Tad doesn't want his boss to know that he is gay, so Julie is totally being his walk-in closet.

泰德不想让老板知道他是同性恋，所以朱莉就成了他的“步入式衣橱”。

（中国日报网英语点津 陈丹妮）