come first

come first

To be the top priority in a particular situation. If you're sick, then you should definitely stay home and rest—your health comes first. Our customers' needs always come first.
See also: come, first
Farlex Dictionary of Idioms.

come ˈfirst

be treated as the most important person or thing in somebody’s life: His work always came first with Joe, which upset his wife a lot.
See also: come, first
Farlex Partner Idioms Dictionary
See also:
  • be worried sick
  • get sick
  • in the first instance
  • in the first place and in the first instance
  • you make me sick
  • feel sick to (one's) stomach
  • take sick
  • sick as a dog, to be
  • be on the mend