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1.
To skim, delve and tread in your thoughts. Moving around in patterns that seem to make no sense, but end up making the most sense of all.

To turn over and constantly obsess about a particular subject, object or person in your mind to the point of almost drowning.
I dove into a glass of wine the other night and ended up thought-swimming about my ex-boyfriend.
by EBthian March 01, 2012