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"Osar" is an intransitive verb which is often translated as "to dare", and "atreverse" is a reflexive verb which is also often translated as "to dare". Learn more about the difference between "osar" and "atreverse" below.
osar()
An intransitive verb is one that does not require a direct object (e.g., The man sneezed.).
atreverse()
A reflexive verb is a verb that indicates that the subject performs an action on itself (e.g., Miguel se lava.).
a. to dare
Los niños no se atreven a meterse al agua fría.The children don't dare go in the cold water.
