crecíais
-you were growing
The word crecíais is the imperfect form of crecer in the second person plural.
See the full crecer conjugation

crecer

Fue tan duro para mi cuando Matt y tú crecíais.
It was so hard for me when you and Matt were growing up.
Me acuerdo de cuando vosotros crecíais.
I remember when you were growing up.
Es decir, lo de cuando crecíais y las dos...
I mean, about growing up and the two of you...?
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