sickie
noun UK informal uk/ˈsɪk.i/ us/ˈsɪk.i/
throw a sickie 称病缺勤；假病假
to say to your employer that you are ill when you are not so that you do not have to go to your place of work for a day
I just didn't feel like work so I threw a sickie. 我不想去上班所以就称病缺勤一天。