Longman Dictionary of Contemporary English homepage

time bomb

 noun
     
Related topics: Weapons, Bombs and Terrorism
time bomb [countable]
1PMWSCB a bomb that is set to explode at a particular time
2 a situation that is likely to become a very serious problem:
Cutting down the rainforest is an environmental time bomb.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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