know which side (one's) bread is buttered (on)

To know how to best ensure one's success. I know which side my bread is buttered on, so I was very nice to the recruiter and promptly sent her a thank you card after our interview.

know on which side your bread is buttered

know where your advantage lies.

See also: bread, butter, know, on, side

Farlex Partner Idioms Dictionary © Farlex 2017

See also:

(I) can't say that I do
can't say that I do
I know
be not to know
by any chance
AFAIK
closed book, a
a closed book
get (all) torn up
before you know it

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