hit it off

hit it off idiom
Get along well together, as in I was so glad that our parents hit it off. In the 17th century this phrase was put simply as hit it, the adverb off being added only in the mid-1800s.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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