hubieran aligerado
-they/you had lightened
Past perfect subjunctiveellos/ellas/ustedesconjugation ofaligerar.

aligerar

Si éstos no se hubieran aligerado mucho en las últimas jornadas, nunca lo habrían conseguido, pero el sonriente y soñador Bombur era un pobre sustituto de las mochilas cargadas de comida, pesasen lo que pesasen.
If these had not become all too light in the last few days, they would never have managed it; but a slumbering and smiling Bombur was a poor exchange for packs filled with food however heavy.
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