Bunk off work
Definition 1 of 1
Pro Tip 1/3Casual Usage
The phrase is informal and best used in casual conversation rather than formal situations. 
I'm so tired. Think I might bunk off work tomorrow.
Pro Tip 2/3Negative Connotation
'Bunk off work' often implies a lack of responsibility or professionalism when missing work. 
He's not sick; he's just bunking off work again.
Pro Tip 3/3Not for Formal Writing
Avoid this phrase in formal writing, job applications, or when speaking with superiors. 
I bunked off work yesterday - oops, I probably shouldn't have written that in my report.