The word "daalen" is spelled with the Dutch digraph "aa" which represents a long "a" sound pronounced as /aː/. The "d" in "daalen" is pronounced as it would be in English, as /d/. The final "en" is pronounced as a schwa vowel sound /ən/. In summary, the phonetic transcription of "daalen" is /daːlən/. This spelling is important to remember when writing in Dutch, as the "aa" sound is distinct from the single "a" sound, which represents a short "a" pronounced as /ɑ/.
The origin of the word "daalen" is from the Dutch language. It comes from the verb "dal" which means "valley". "Daalen" is the infinitive form of the verb and translates to "to descend" or "to go down" in English.