persist
intransitive-verb
UK: /pəˈsɪst/
US: /pərˈsɪst/
To continue to do something despite difficulty or opposition.
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I will persist with my studies.
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Even though it was hard, she had to persist in her efforts to succeed.
To continue to exist or happen for a long time.
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The problem will persist if you don't fix it.
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If the symptoms persist, you should see a doctor for proper treatment.