apply for the Chiltern Hundreds

To leave one's job, office, post, etc. If members of the British House of Parliament wish to resign from office before the end of their term, they must apply to the honorary post of the "Chiltern Hundreds" (an obsolete administrative district in south-central England). Primarily heard in UK. I can't stand this job's stressful clients and erratic schedule any longer—it's time for me to apply for the Chiltern Hundreds. You better give Mark a raise or something. Otherwise, I think he's going to apply for the Chiltern Hundreds, and then you'll have to fill his position all over again! This job is taking a serious toll on your health, honey. I really think you need to apply for the Chiltern Hundreds