not cup of tea
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Related to not cup of tea: not my cup of tea
not (one's) cup of tea
Not something one prefers, desires, enjoys, or cares about. Thank you for the invitation, but long-distance cycling just isn't really my cup of tea. When I found out that reading wasn't his cup of tea, I knew that there wasn't much of a relationship in store between us.
not one's cup of tea
Fig. not one's choice or preference. (Used to describe an activity you do not enjoy. Can sound somewhat affected.) You three visit the museum without me. Looking at fussy old paintings is not my cup of tea. Going to church, Mary said, was not her cup of tea.