Fun in language learning:

I wrote "gnu-radio has a steep learning curve" on a mailing list.

A native English speaker commented "[..] steep learning curve would actually mean that you understand a topic quickly". Then I realized: I had never actually thought about the phrase, I had merely heard others using it, inferred a meaning, and then started to use it.

en.wikipedia.org/wiki/Learning
The thread is here: lists.tlug.jp/ML/2601/msg00001

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