A man of his word. One whose word may be depended on; trustworthy. As good as his word. In French, “Un homme de parole. ” One who keeps his word. By word of mouth. Orally. As “he took it down by word of mouth” (as it was spoken by the speaker). I take you at your word. In French, “Je vous prend au mot. ” I will act in reliance of what you tell me. Pray, make no words about it. In French, “N'en dites mot. ” Don't mention it; make no fuss about it. Speak a good word for me. In French, “Dites un mot en ma faveur. ” To pass one's word. In French, “Donner sa parole. ” To promise to do something required. Upon my word. Assuredly; by my troth.
“Upon my word, you answer ... discreetly.” Jane Austen.
Upon my word and honour! A strong affirmation of the speaker as to the truth of what he has asserted.
(The). The second person of the Christian Trinity. (John i. 1.)
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894