Final answer:
The sentence 'We landed green in the gills in northern California' contains a figurative language device known as an idiom.
Step-by-step explanation:
The sentence 'We landed green in the gills in northern California' contains a figurative language device known as an idiom. An idiom is a phrase or expression that has a meaning different from its literal interpretation.
In this case, 'green in the gills' is an idiom meaning to feel sick or nauseated. So, the sentence suggests that the speaker feels unwell after landing in northern California.
Idioms are commonly used in English to add color and imagery to the language. They may require some background knowledge or context to understand their intended meaning.