What is Cotton On?
1.
To realize or catch on to something - usually something in the past which you should have figured out at the time but didn't; Scottish slang.
She was giving all kinds of hints that she was interested in me, but I just didn't cotton on until I got home.
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See unavailable, error, server
7.
(v.i.) Out to lunch; not having it together; acting in a stupid way. Typically derogatory.
Derivation: ..
