1. To remain loyal, committed, or optimistic despite difficulties or challenges
Even when times are tough, you have to keep the faith and believe things will improve.
Mesmo quando os tempos são difíceis, você tem que manter a fé e acreditar que as coisas vão melhorar.
2. To maintain one's religious or spiritual beliefs and convictions
She kept the faith throughout her life, attending church every Sunday.
Ela manteve a fé durante toda sua vida, frequentando a igreja todos os domingos.