a damsel in distress
US /ə ˌdæm.zəl ɪn dɪˈstres/
UK /ə ˌdæm.zəl ɪn dɪˈstres/

1.
a young woman in trouble who needs a man's help
:
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The knight rode in to save the damsel in distress from the dragon.
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She always plays the role of the damsel in distress in movies.