pluck up courage
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pluck up (one's) courage
To emotionally prepare oneself to do a frightening or overwhelming task; to bolster one's courage. I'm really nervous about asking Sarah out on a date, but I just need to pluck up my courage and go through with it. I know he's terrified of speaking in public, so he's plucking up his courage with a stiff drink.
pluck up someone's courage
to bolster someone's, including one's own, courage. I hope you are able to pluck up your courage so that you can do what has to be done. Some good advice from a friend helped pluck up my courage.