From Angst (“fear”) + Hase (“hare”). The compound could simply be based on the hare’s flight instinct, but is usually thought to be an alteration of unattested *Angsthose, from Hose (“trousers, pants”); compare German Bangbüxe, Dutch bangebroek, English fraidy cat or English scaredy pants.
- He, Angsthase! Traust dich wohl nicht?
- Hey, coward! Don't you dare?
- Angsthase in Duden online