päätäsi
päätäsi is a Finnish phrase meaning "your head." It is formed by taking the partitive singular form of the noun pää (päätä) and adding the second-person singular possessive suffix -si, resulting in päätäsi, which literally corresponds to “your head.”
In Finnish grammar, the partitive case is often used with verbs that express ongoing states, partial objects,
Usage and nuance: päätäsi tends to appear in contexts describing physical sensations or conditions affecting the
Related forms include päänsä (his/her head) and pää (head) in other cases or with other possessive suffixes.
See also: Pää, päänsärky, Finnish possessive suffixes, Finnish partitive case.