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Old August 10, 2019, 07:51 AM
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aleCcowaN aleCcowaN is offline
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Join Date: Aug 2010
Location: Buenos Aires, Argentina
Posts: 3,127
Native Language: Castellano
aleCcowaN is on a distinguished road
a oscuras/obscuras = in the dark

I don't know the reason but many of these expressions using adjectives become nouns are plural and feminine:

a ciegas = blindly (literally)
a oscuras

but other expression use nouns in plural (or singular) of any gender

a tientas = blindly (it literally means "by using the sense of touch")
a gatas = crawling (on your hands and knees)
a pedazos = in pieces
a gusto = comfortably
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