to have faith in your own ability or decision
tener fe en tu propia habilidad o decisión (tener fe en tu propia habilidad o decision)
"You have to back yourself up if you want others to trust you."
"Tienes que respaldarte a ti mismo si quieres que los demás confíen en ti." (Tienes que **respaldarte a ti mismo** si quieres que los demas confien en ti)
to start fresh with renewed optimism
to study or work late into the night
to face a problem or difficulty
to return money that you borrowed
to ask someone earnestly or formally for help
to go somewhere for a short vacation or break