It is hard, but you must stay the course.
stay the course
idiomTo persist or continue, especially in the face of difficulties.
Even when the project became difficult, the team decided to stay the course until they finished.
Despite the mounting opposition from his critics, the leader resolved to stay the course and implement the reforms he had promised.
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crash course
A quick, intense course of learning, especially one which is informal or hurried.
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due course
Regular or appropriate passage or occurrence
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let nature take its course
To permit events to proceed or a situation to develop without intervention or interference.
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matter of course
A natural or logical outcome; perforce.
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par for the course
To be expected; normal; common.
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reverse course
To stop and proceed in the opposite direction.
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stay away
To avoid or not go anywhere near someone or something.
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stay behind
To remain where one is, whilst others leave.