time bomb

noun
1
a bomb that can be set to explode at a particular time
بمب ساعتی, بمب زمان‌دار, بمب زمان‌بندی‌شده, بمب با تایمر
2
a situation that is likely to cause serious problems in the future
تهدید بالقوه, خطر بالقوه, شرایط بحرانی
Rising unemployment is a political time bomb for the government.
He described global warming as ‘an environmental time bomb ticking away’.