It means something conducted in secret.
It means a double of a person; having a keen resemblance between two otherwise unrelated persons.
It means to whisper in someone’s ear as a means to persuade or irritate them.
It means an intense feeling of elation, excitement, or pleasure.
It means something delicate or insubstantial.
It means speaking foolishness, nonsense, or insincerely.
It means small in size, particularly a small child.