We found 3 dictionaries that define the word lose one's rag:

General (2 matching dictionaries)

1. lose one's rag, lose one's rag: Collins English Dictionary
2. lose one's rag: Wiktionary

Slang (1 matching dictionary)

3. lose one's rag: English slang and colloquialisms used in the United Kingdom

Definitions from Wiktionary (lose one's rag) ▸ verb:  (slang) To become angry. ▸ Words similar to lose one's rag ▸ Usage examples for lose one's rag ▸ Idioms related to lose one's rag ▸ Wikipedia articles (New!) ▸ Words that often appear near lose one's rag ▸ Rhymes of lose one's rag ▸ Invented words related to lose one's rag