RichThesaurus
lose one's rag
vs
vent one's spleen
lose one's rag
verb
To become angry.
vent one's spleen
verb
To openly express pent-up anger, often on an unrelated matter or person.
How often have the words
lose one's rag
and
vent one's spleen
occurred in a corpus of books?
(source:
Google Ngram Viewer
)