This is the 501st most frequent Thai word.
ถนนว
It seems there might be a typo in the word "ถนนว". If you meant "ถนน," it means "road" or "street" in English.
The word 'ถนน' in this sentence means 'street' and is used to refer to a physical road.
ถนนสายนี้มีรถเยอะมากในช่วงเวลาเร่งด่วน
This street is very crowded with cars during rush hour.
In this context, 'ถนนว' is part of an idiomatic expression meaning informal or colloquial language, showing a metaphorical usage.
การพูดจาแบบถนนวไม่เหมาะกับการประชุมที่เป็นทางการ
Street slang is not appropriate for formal meetings.
Here, the word 'ถนน' is used poetically to describe the act of moving along a road, indicating the journey.