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With a large amount of details; very explicitly or thoroughly. I explained in detail how the proposed system would work, but I think I may have confused some people in the audience.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
with lots of details; giving all the details. (Often used with an adjective showing the level of detail, such as great, enormous, etc., as in the second example.) I explained the policy to the customer in detail. We planned the entire project in great detail.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
With close attention to particulars; thoroughly. For example, She explained her theory in detail. It is also put as go into detail, meaning "to investigate thoroughly," as in You know what I mean, so I needn't go into detail. The first expression dates from about 1600, the second from the late 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.
With attention to particulars; thoroughly or meticulously: explained her proposal in detail.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.