v.1. To provide something or someone with additional support; prop up someone or something: We used plywood to brace up the wall paneling. The old tower would have fallen down if we hadn't braced it up.
2. To prepare or strengthen someone or something to face some challenge: We braced up the car for the road race. They gave me some encouraging words to brace me up for the interview. I'm glad you were braced up for your exams.
3. To summon one's strength or endurance; prepare to face a challenge: I spent all day bracing up for my performance in the concert that evening.