Final answer:
The figurative language used is a metaphor to convey Omakayas' emotions.
Step-by-step explanation:
The figurative language used in the phrase 'Omakayas thought with a sinking stomach' is a metaphor. A metaphor is a figure of speech that directly compares two things by stating that one thing is another. In this case, the author is using the sinking feeling in Omakayas' stomach to convey her thoughts or emotions. The author wants you to know that Omakayas is feeling anxious, worried, or uneasy about something.