RichThesaurus
butter someone's biscuit
vs
float someone's boat
butter someone's biscuit
verb
To interest or appeal to someone; to make someone happy.
float someone's boat
verb
To interest or appeal to someone; to make someone happy.
How often have the words
butter someone's biscuit
and
float someone's boat
occurred in a corpus of books?
(source:
Google Ngram Viewer
)