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Phrase(s): Keep your chin up.
Fig. an expression of encouragement to someone who has to bear some emotional burdens. (Fixed order.) • Fred: I really can’t take much more of this. Jane: Keep your chin up. Things will get better. • John: Smile, Fred. Keep your chin up. Fred: I guess you’re right. I just get so depressed when I think of this mess I’m in.
McGrawhill's American Idioms And Phrasal Verbs