lose the drift/thread of something

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lose the ˈdrift/ˈthread of something

be unable to follow a story, discussion, etc. because you cannot understand the relationship between events, facts, etc: I had to go out in the middle of the film and when I came back I found I’d lost the thread entirely.When they started talking about artificial intelligence, I completely lost the drift of the argument.
See also: drift, lose, of, something, thread