Dutch ‧ man /ˈdʌtʃmən/ BrE AmE noun ( plural Dutchmen /-mən/) [countable]
1 . a man from the Netherlands
2 . I’m a Dutchman British English spoken used to show that you do not believe something:
If that ball was out, then I’m a Dutchman.
Dutch ‧ man /ˈdʌtʃmən/ BrE AmE noun ( plural Dutchmen /-mən/) [countable]
1 . a man from the Netherlands
2 . I’m a Dutchman British English spoken used to show that you do not believe something:
If that ball was out, then I’m a Dutchman.
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012