Trust according to Cambridge dictionary “is to believe that someone is good and honest and will not harm you, or that something is safe and reliable.”
Trust which has these two alphabets u and s (us) meaning more than one person and also has r and t when you combine them with u and s you get rust which I can define based on the general thinking as when an attractive thing gets less attractive or a good thing goes bad.
Of all the things to use to form trust was with rust. I will conclude that trust cannot exist without rust. The moment you decide to trust someone, a group of people or anything, it means you have decided that when things get rusty you will not complain.