"quedarse tranquilo" in English

to lay over- to linger- to put up- to shake down- to stay behind- to stay over- to stick around- to stop- to stop on- to peg out- v + adv- to remain- to keep- to stay- to stay on- to take- to gave sb. on- to run out of sth.

calm- chill- easygoing- laid-back- laid-back- peaceable- peaceful- quiet- still- tranquil- untroubled- fringy- undisturbed- composed- cool- dreamless- placid- relaxed- restful- sedate- smooth- uneventful- unhurried

easily

keep calm!