Recently I had to write an application letter, and when my teacher examined it; he marked the following sentence as incorrect (because of the supposedly wrong usage of 'supplement')
I would like to supplement my theoretical knowledge with practical knowledge, in accordance with your motto: 'learning by doing'.
I couldn't find supplement as a verb in my Dutch-English dictionairy, but various sources online say it can also be used as a verb. In this case, was I wrong? And if so, what would be the appropriate verb?