be suspended in the air, as if in defiance of gravity; "The guru claimed that he could levitate";
move to and fro; "The shy student lingered in the corner";
be undecided about something; waver between conflicting positions or courses of action; "He oscillates between accepting the new position and retirement";
hang over, as of something threatening, dark, or menacing; "The terrible vision brooded over her all day long";
