Meaning of verbal suffix ～てくたっとしてしまう I've come across several cases of verbs with the suffix , but am unsure how to break this suffix down, or what it means exactly. It seems that this is the -form of the base verb, followed by something that looks like , perhaps followed by the particle and the verb in the -form, followed by the auxiliary verb , but I'm having no luck finding a grammatical description of the middle part here (?). A quick Google search finds many examples of sentences using this kind of structure, such as: * * * Would anyone be able to clarify the grammatical function at work here?

is a mimetic word meaning something like "floppy", "tired", "withered", etc. It's a variation of / . means "to become withered", etc.

When you have seen an unfamiliar mimetic/onomatopoeic word in the form of , it's a good idea to repeat the mimetic/onomatopoeic part and look it up in a dictionary. (e.g., look up instead of ) See: How are the giongo/gitaigo double form and tto form related ( vs. )

You have parsed the remaining part correctly. To clarify, is not a set "suffix" at all. It's just four words: + + + , meaning something like "and (it) ends up becoming floppy".