What does chin mean?

[Ilma]

English Idioms and Expressions, Elementary Level

ESL/EFL Test #12 "Just keep it", question 10

My only advice to Charlie was to keep his chin up and stop worrying.

(a) try to hold his head straight
(b) try to be optimistic
(c) try not to look on the ground
(d) try to remain upright

English Idioms and Expressions, Elementary Level

ESL/EFL Test #12 "Just keep it", answer 10

My only advice to Charlie was to try to be optimistic and stop worrying.

Correct answer: (b) try to be optimistic
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what is chin?

Ilma

[Mister Micawber]

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Your chin is the part of your jaw that projects below your mouth. Men shave their chins or grow beards on them. 'Keep your chin up' is an idiom meaning 'be optimistic'. (The image is not to let your chin sag down to your chest in a sign of despair).
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Native English teacher at Mister Micawber's