This is the 605th most frequent French word.
bas
"Bas" (adj.) in French means "low" in English.
Here, 'bas' is used as an adjective meaning 'low,' describing the prices.
Les prix sont très bas cette saison.
The prices are very low this season.
Here, 'bas' is plural and used as a noun meaning 'stockings,' a type of clothing for the feet.
Elle a acheté des bas en coton.
She bought cotton stockings.
In this sentence, 'bas' acts as a noun referring to the lower part of something, specifically the mountain.