This is the 931st most frequent Spanish word.
caer
"Caer" means "to fall" in English.
Here, 'caer' is used colloquially to mean 'to like,' referring to one's level of fondness or comfort with another person.
Me caes muy bien, eres muy amable.
I like you a lot; you're very kind.
In this context, 'caer' is metaphorical, symbolizing the loss or failure of ideas to succeed or hold.
Mis ideas comenzaron a caer una por una.
My ideas began to fall one by one.
The word 'caer' is used in its standard meaning, 'to fall', describing the physical action of an object falling due to gravity.