[…] a letter was delivered to Marianne, which she eagerly caught from the servant, and, turning of a death-like paleness, instantly ran out of the room. Elinor, who saw as plainly by this, as if she had seen the direction, that it must come from Willoughby, felt immediately such a sickness at heart as made her hardly able to hold up her head, and sat in such a general tremour as made her fear it impossible to escape Mrs. Jennings’s notice.
Source: wiktionary