A faint unease came over him; nevertheless he picked up the martini glass and swirled it, watching the olive at the bottom bob slightly in the drink’s chilly depths. Source: The Shining by Stephen King What does the bolded phrase mean? In this scene, Jack is imagining the bar coming to life. Is bob a verb and the olive the subject? Why not the olive bobs? Is it an olive print at the bottom of the martini glass? What is the drink's chilly depths mean? Thank you.