Context
Predicting a result before a match.
Es seguro como la muerte y los impuestos.
As certain as death and taxes — the Spanish equivalent idiom. Dramatic but widely known.
Absolute certainty — there's no doubt, this is guaranteed, bank on it.
'Cierto muerto' means 'dead truth' which is nonsense. Spanish certainty uses different vocabulary.
Context
Predicting a result before a match.
Es seguro como la muerte y los impuestos.
As certain as death and taxes — the Spanish equivalent idiom. Dramatic but widely known.
Context
Knowing you'll get the job before the interview.
Eso está cantado.
'It's sung' — already decided, a foregone conclusion. One of the most useful Spanish idioms.
Context
Knowing a horse will win before the race.
Es un pleno seguro.
A sure thing — pleno can mean a full win, a certainty. Betting language.
Context
Predicting a colleague will be chosen for the promotion.
Eso está hecho.
It's done — already decided, inevitable. Quiet confidence in the outcome.
Context
Someone is going to get in trouble — it's only a matter of when.
Le va a caer una buena, seguro.
He's going to get a good one, for sure — a punishment is certainly coming.