1. To cause something to remain inside due to rain: We wanted to go hiking, but we were rained in.
2. To cause something to take place inside due to rain. Used chiefly in the passive: Our outdoor party was rained in, but we still managed to have fun.
See also: rain
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.