first things first
US /fɜrst θɪŋz fɜrst/
UK /fɜrst θɪŋz fɜrst/
1.
used to say that the most important thing should be dealt with before anything else
:
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Okay, first things first, let's make a plan.
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Before we discuss the details, first things first, we need to agree on the main goal.