What's I remember my chin hitting my chest mean?

Question

Please, answer me.

Is it like gaving a resigned sigh when someone feel disappointed?

Related contents as below:
In his book “INFLUENCE The Psychology of Persuasion,” Robert B. Cialdini, Ph.D., writes:

“I know of no better illustration of how reciprocal obligations can reach long and powerfully into the future than the perplexing story of five thousand dollars of relief aid that was sent in 1985 between Mexico and the impoverished people of Ethiopia. In 1985 Ethiopia could justly lay claim to the greatest suffering and privation in the world. Its economy was in ruin. Its food supply had been ravaged by years of drought and internal war. Its inhabitants were dying by the thousands from disease and starvation. Under these circumstances, I would not have been surprised to learn of a five-thousand-dollar relief donation from Mexico to that wrenchingly needy country. I remember my chin hitting my chest, though, when a brief newspaper item I was reading insisted that the aid had gone in the opposite direction. Native officials of the Ethiopian Red Cross had decided to sen

Answer 1

I've known it to be used in two ways... one, yes, the sad sigh with the whole head bending over, eyes closed, as in resignation to an unwelcome thought.

The other is in shock. Normally, I would think of this as "my chin hit the floor" but I have seen it used that way.

I think the first onefits the passage you quoted, however.

Answer 2

It means you remember a time in the past where your chin made somewhat forceful contact with the external portion of the chest area.

Answer 3

It could mean that you remembered going to sleep. Where your head drops and results in your chin making contact with your chest.

Answer 4

sounds like his jaw dropped so far that his chin hit his chest at his surprise of the donation going backward .
(think of a cartoon where the jaw drops to the ground from surprise).