Translation of verschmutzen

Mr. Chang informed me that you have a customer that requires similar applications to what my customers have here in Switzerland. I am planning my next trip and I will consider visiting you too.
The belief of somebody that a race or a group of people to which he belongs is superior to another. Even though the word itself stems from the word 'race', its meaning must be generalized.
Swimming in the open water was refreshing and fun and some of us jumped of the roof of the boat into the deep waters. After another snack break the four of us were invited for a Kayak excursion.