The Tour - à leur tour

This is another example of old language which will be nonsense to most people who speak 'modern' French.  In modern French it means 'their turn' .  'Their Turn' is colloquial for 'turn about' or a curse

(La malediction).  If I'm interpreting these things incorrectly, please tell me.  We have to learn from OUR MISTAKES... I don't think so, but linguistic scholars will know the same or better.  There is no use in presenting false information.