Lose the drift/thread of something expression phrase
"Thread" in this expression means something that connects the various points of a narrative.
Can no longer understand or follow something, such as an argument, story, discussion, etc. because one has become distracted or bewildered.
Losing the thread of the conversation in a meeting is a common problem, whether you are a native speaker of the language being spoken or not.
Try not to let your mind wander; otherwise, you will lose the thread of this complicated story.
I forgot to stop the movie before going to the bathroom, so when I came back, I totally lost the thread.
The verb "lose" must be conjugated according to its tense.
This expression dates from the mid 1900s.
Completely dark, without any light or color
I'm scared of the basement! It's as black as a skillet!