This is the 12342nd most frequent Swedish word.
sjukanmäler
To report sick or notify absence due to illness.
Here, 'sjukanmäler' is used reflexively (sjukanmäler mig) to indicate that the subject is reporting themselves as sick.
Jag sjukanmäler mig till arbete idag.
I am calling in sick to work today.
'Sjukanmäler' is used in the plural and reflexive form (sjukanmäler sig) to describe a habit among multiple individuals.
Mina kollegor sjukanmäler sig ofta under vintermånaderna.
My colleagues often call in sick during the winter months.
'Sjukanmäler' is used transitively here, showing that the subject is reporting someone else's condition as sick (his daughter).