adverb, noun which may take the genitive case particle 'no'
barely; just; narrowly; with difficulty
Describes a situation where one barely manages to do something, often with a sense of scraping by or just meeting a minimum requirement. Mimetic word.
給料日前で、いつもカツカツの生活だ。
Before payday, I'm always living hand-to-mouth.
締め切りにカツカツで間に合った。
I barely made the deadline.