My English is very poor.So it’s hard for me to explain.
But I tried my best,
“暮”It means Twilight.
“狗”It means Dog.
“瞪”It means to stare eyes.
“呆”It means Shock.
This is a Chinese four-word idiom-“目瞪口呆”.It means Stunned.
And the pronunciation of Twilight(暮) in Chinese is the same as that of eyes(目).
And the mouth(口) is close to the dog(狗)’s pronunciation.
So, can you get it?