quick sand

基本解释

Two people stuck in quick sand can't help each other.
两个陷入流沙的人是不可能互助的。
Such as Charlie's idea to put tires on it strong enough to trek through quick sand, for my safety of course. Charlie still worries about me.
比如说“务必把轮胎牢牢地固定在车上”的提议就是我的老爸查理想出来的，为了在我跋山涉水时不受流砂的威胁，当然，更是为了他宝贝女儿的人身安全。
603976421.qzone.qq.com
If you come across an obstacle or an impasse, pay mind to it but don't focus on it for too long, or your feet may sink into the quick sand that surrounds it.
假如你遇到障碍，或者陷入绝境，用心对待它，但不要长时间纠缠于其上，否则你可能会深陷于环绕在这个困境周围的流沙之中。
blog.sina.com.cn

Whether this is a viable option for you or not is up to you, but doing the research is key to staying out of financial quick sand.
FORBES: Student Credit Cards: The Good, The Bad and The Ugly
Clarksville has a flood protection system in which a temporary levee — aluminum slats filled with sand — can be built if the river rises, but the Mississippi was too quick this time.
NPR: Crests Approaching In Several Towns In Midwest

Quicksand is deep, wet sand that you sink into if you try to walk on it.
You can refer to a situation as quicksand when you want to suggest that it is dangerous or difficult to escape from, or does not provide a strong basis for what you are doing.