used as an expression of surprise or despair UK, 1841.
2
yes indeed! Shortening of 'upon my word!' AUSTRALIA, 1857
(upon) my word
An interjection expressing surprise, amazement, or incredulity. Upon my word, I cannot believe that my own wife would stoop to such depths of treachery!My word, Jenkins, this report is simply terrible. You're going to have to do better than that if you want to stay in this company.
(upon) my ˈword!
(old-fashioned) used to express surprise: My word! That was quick!