by word of mouth


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See: oral
References in classic literature ?
Inform the gentleman at once--either by word of mouth or by writing--of the position in which he stands: and authorize him to place the case in the hands of a person known to you both, who is competent to decide on what you are to do next.
However, as it must be done, he had no choice but to do it; so, after attempting several letters, and failing in them all, he resolved to do it by word of mouth.
would fear to paint his happiness in the cold phrases of a written letter, but would wait to tell it by word of mouth.