pluck up
pluck up {v.}
1. To have (courage) by your own effort; make yourself have (courage).
In spite of failure, he plucked up heart to continue.
He plucked up courage when he saw a glimmer of hope.
2. To become happier; feel better; cheer up.
He plucked up when his wife recovered.
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Source: A Dictionary of American Idioms