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

1.
causar problemas, indicar problemas
to indicate that something bad is likely to happen
:
•
His constant tardiness could spell trouble for his job.
Seu atraso constante pode causar problemas para o seu emprego.
•
The dark clouds on the horizon spell trouble for our picnic.
As nuvens escuras no horizonte indicam problemas para o nosso piquenique.