number one priority
/ˈnʌmbər wʌn praɪˈɒrɪti/ · num·ber one pri·or·i·ty
noun
- The most important or urgent matter that must be addressed before all others. Ensuring the safety of the crew is the number one priority on every flight.
Synonyms
top priorityprimary concernmain focusforemost concernchief priorityprincipal aimkey objectiveleading priority
Antonyms
Did you know? The phrase gained widespread corporate usage in the 1970s, appearing in NASA mission briefings to stress the utmost importance of safety and mission success.