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je raterais

would miss, would mess up, would ruin

→ rater
rater to miss + ais je/tu conditional
verb · 1st-person singular / 2nd-person singular Rare #48,474
would miss In the expressions « ne… pour rien au monde » and « pour rien au monde », it means you would not miss something for anything in the world.
FR: Je ne raterais pas le train.
EN: I wouldn’t miss the train.
would mess up, would ruin Informal; used when talking about doing something badly.
FR: Je raterais sûrement cette recette sans ton aide.
EN: I’d probably mess up this recipe without your help.
Conjugation of rater
Conditional
SingularPlural
First raterais —
Second raterais —

Pour rien au monde je n'en raterais un !

There’s no way I’d miss one!

— Star Trek IV : Retour sur Terre (1986)

Je raterais un œuf au plat, tu sais bien.

I’d mess up a fried egg, you know that.

— Amours chiennes (2000)

Je raterais mon programme télé préféré, Science Fiction Theatre.

I’d miss my favorite TV show, Science Fiction Theatre.

— Retour vers le futur (1985)

Je ne le raterais pour rien au monde.

I wouldn't miss it for the world.