Which expression means to remain positive during difficult times?

The expression "keep your chin up" is a well-known idiom that means to stay cheerful and optimistic, especially during challenging or difficult situations. It conveys the idea of maintaining one’s spirits and not giving in to despair, suggesting an attitude of resilience and hope. This phrase is often used to encourage someone who may be feeling down or facing adversity, reminding them to hold onto a positive outlook despite hardships.

In contrast, the other expressions do not convey the same sense of maintaining a positive attitude during tough times. Keeping track of something refers to monitoring or managing details, keeping an eye on something means to watch it closely, and keeping a diary relates to writing down thoughts or experiences, which does not directly address the idea of positivity in adversity.