1. To remain calm, stable, and constant in difficult circumstances
Stay steady during the turbulence; the plane will be fine.
Mantenha-se firme durante a turbulência; o avião ficará bem.
2. To continue in a consistent manner without changing course or losing focus
Stay steady with your workout routine and you'll see results.
Mantenha-se firme com sua rotina de exercícios e verá resultados.
3. To maintain emotional composure and psychological balance
Stay steady; everything will work out in the end.
Mantenha a calma; tudo funcionará no final.