noun
BAD : We were shown what to do if there was an emergency event.
GOOD : We were shown what to do in an emergency (situation).
BAD : A basic understanding of car engines can be very useful, especially in emergency cases.
GOOD : A basic understanding of car engines can be very useful, especially in emergencies.
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emergency or emergency situation : 'Should you ever have to deal with an emergency, just stay calm and try not to panic.'