spell trouble
US /spɛl ˈtrʌb.əl/
UK /spɛl ˈtrʌb.əl/

1.
带来麻烦, 预示麻烦
to indicate that something bad is likely to happen
:
•
His constant tardiness could spell trouble for his job.
他经常迟到可能会给他的工作带来麻烦。
•
The dark clouds on the horizon spell trouble for our picnic.
地平线上的乌云预示着我们的野餐会有麻烦。