I touch my neck instinctively when I let my guard down.

我放松警惕的时候，就会本能地摸自己的脖子。

youdao

The guard felt the hair on the back of his neck stand on end.

门卫感到自己的头发根都竖了起来。

youdao

The high guard (sometimes called the "high wing") is a deflection. The supporting hand is used to check. The attack is generally to the head or neck.

高防势(有时也叫高翼势)是一个斜架的姿势，支撑手用来阻挡。用来防护对头和颈部的攻击。

youdao

Security guard Joshua Keasler had sued Manson after the star allegedly put his legs around Keasler's neck and gyrated against him on stage at a 2001 concert.

BBC: NEWS | Entertainment | Manson civil sex case is dropped

But in the third round Sylvia let his guard down for a split second, allowing Nogueira, a Brazilian jujitsu master, to grab his neck and pull.

FORBES: Magazine Article