Unbuttoning my top collar button.

不扣衣领最上面的纽扣。

youdao

A float collar is placed at the top of the float joint and a float shoe placed at the bottom to prevent reverse flow of cement back into the casing after placement.

浮箍是放置于浮动接头之上的，而浮鞋则是放置于浮动接头之下，以防止水泥浆回流到套管内。

youdao

So he turned up his collar and shuffled across the top of the dam (luckily it wasn't so slippery since the snow had fallen) to the far side of the river.

所以他竖起衣领，拖着脚步，穿过堤坝顶部(幸亏下了雪，上面才没那么滑)，向远处河边走去。

youdao

She returned with a brand new seasonal Christmas cup complete with its post-consumer waste collar and plastic top.

FORBES: The Reusable Cup Experiment

Instead, they have faced stiff opposition from well-financed defendants represented by the top lawyers from the white collar defense bar.

FORBES: Move up http://i.forbesimg.com t Move down

Cintamani, 36, interrupts the discussion on Singapore's economic environment, drawing attention to two men one in a three-piece black suit, and another in a futuristic-looking white top embellished with silver at its collar and reaching past his knees over skinny white pants with platform shoes and a woman in a white two-piece, loose-fitting suit with silver heels.

WSJ: Wealth Over the Edge | WSJ.Money Spring 2013