had tightened
-había apretado
Past perfectconjugation oftighten.There are other translations for this conjugation.

tighten

The difficulty is that, back in 1999, when we discovered a problem in Belgium, we thought then that we had tightened up our rules sufficiently so that there would not be another incident.
La dificultad reside en que, en 1999, cuando descubrimos un problema en Bélgica, pensamos que habíamos reforzado nuestra normativa lo suficiente como para que no se produjera otro incidente.
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