was thickening
-estuve espesando
Past progressive conjugation of thicken. There are other translations for this conjugation.

thicken

The forest was thickening and Jane began to feel afraid.
El bosque se hacía más denso y Jane comenzó a sentir miedo.
The fog was thickening and I could no longer see the hills ahead.
La niebla se hacía más espesa y ya no veía las colinas que había delante de mí.
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