side street
The word 'Mund' in German translates directly to 'mouth' in English. It is used to refer to the opening in the human or animal face through which food is taken in and from which speech and other sounds are emitted. It is also used in some idiomatic expressions, such as 'jemandem etwas aus dem Mund nehmen' (to take the words out of someone's mouth) or 'jemandem etwas auf den Mund schneidern' (to tailor something to someone's mouth).
I burnt my mouth.
This sentence expresses that the speaker has hurt themselves, specifically their mouth, possibly by eating or drinking something too hot.
He made my mouth water.
This sentence uses an idiomatic expression to convey that something, often food or drink, is very appealing to the speaker.