What is Duty Calls?
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It's an expression to say you've got to do something. To do your duty or when something reminds you to do your duty.
An simple example of this is:
When your you're chilling on a sofa and suddenly your baby starts crying and you gotta check it out, then you might say: Oops! Duty calls!!
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The full phrase is 'If a tree falls in the forest but nobody is around to hear it, does it make a sound?'.
It symbolizes the ..