estuvieron endureciendo
-they/you were hardening
Preterite progressiveellos/ellas/ustedesconjugation ofendurecer.
See all conjugations of endurecer

endurecer

TRANSITIVE VERB
(to make harder or tougher)-to harden
Synonyms for endurecer
helar
to freeze
Antonyms for endurecer
suavizar
to soften
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