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1. Literally, in the wrong direction or away from the intended course. Could you check the map? I think we're a bit off course.
2. By extension, going against or straying away from an established plan or the correct or intended course of action. I got a little off course after my girlfriend broke up with me, so I'm trying to get refocused on my studies. This project is so off course that I don't know if it's worth continuing.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
1. Lit. not going in the right direction. (*Typically: be ~; drift ~; get ~.) The ship is off course and may strike the reef!
2. Fig. not following the plan correctly. (*Typically: be ~; get ~.) The project is off course and won't be finished on time. l am off course and doing poorly.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
Away from the planned or intended course.
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.