mucker
Pronunciation: /ˈmʌkə/
noun

Phrases
-
come a mucker
- British informal, datedanother way of saying come a cropper (see cropper).

Origin:
Middle English: from muck + -er1; mucker (sense 2) probably from the phrase muck in. mucker (sense 3) is probably from German Mucker 'sulky person'