finish dead last

To reach the end of something, such as a race or other competition, in last place, especially by a wide margin. I didn't train at all for that marathon, so I guess it's no wonder I finished dead last. In a survey among consumers about which smartphone they would like, the new entry from PhonePro finished dead last. You finished dead last at the Science Fair because it looks like you spent all of 10 minutes on your project!