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"Agua fría" is a phrase which is often translated as "cold water", and "agua caliente" is a noun which is often translated as "hot water". Learn more about the difference between "agua fría" and "agua caliente" below.
agua fría()
A phrase is a group of words commonly used together (e.g., once upon a time).
1. (general)
la agua caliente()
A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).