on the anxious seat
1. Sitting in an area at a revival meeting that has been designated for the atonement of sins. Primarily heard in US. You need to go spend some time on the anxious seat after treating your sister so poorly!
2. Feeling uneasy and nervous, usually while awaiting the outcome of something. I know I'm going to be on the anxious seat until I get my test results back. Fans are certainly on the anxious seat while this goal is being reviewed.