1. To cause someone or something to be stuck inside due to extreme weather conditions. A noun or pronoun can be used between "weather" and "in"; often used in passive constructions. We were so excited for a vacation on the beach, but the monsoon weathered us in the whole time. We've been weathered in for nearly a week in this cabin—I hope the snow melts soon, or we're going to start running out of food!

2. To cause someone or something to be unable to move, operate, or be accessed due to extreme weather conditions. A noun or pronoun can be used between "weather" and "in"; often used in passive constructions. The second, smaller hurricane has weathered in rescue services trying to provide aid to victims of the first one. The entire marina was weathered in by the freak snowstorm, meaning no boats could leave or enter until the snow and ice had been cleared.