acortaban
Imperfectellos/ellas/ustedesconjugation ofacortar.

acortar

Sus telómeros no se acortaban conforme pasaba el tiempo.
Their telomeres weren't shortening as time marched on.
En los meses de verano, las horas escolares se acortaban de forma considerable.
In the summer months the hours for school were greatly shortened.
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Grim Reaper