Possible Results:
Imperfect conjugation of retener.
Imperfect vos conjugation of retener.
reteñías
Imperfect conjugation of reteñir.

retener

Y cada vez que la retenías cambiaba su curso.
And every time you held it back it changed its course.
¿Mientras la retenías sin vender, no la retenías para ti?
While it remained unsold, did it not remain your own?
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to skate