Crumbles
Part of speech: Verb
Definition: to break into small pieces.
Source: Merriam-Webster Dictionary
The word is found in the Amy Lowell poem Alien, in the fifth and final line.
“My spirit crumbles at their teasing touch.”
She is using the word a s a verb to an action but is using figurative language to exaggerate her feelings because her spirit cant be broken into little pieces.