I shudder whenever I heard WW1 being called 'the Great War' - it killed millions in the most atrocious of ways, on both sides- and served no purpose at all, none
Well if you had said it was your DGS who didn't understand , instead of saying how you felt, a lot of misunderstanding might have been avoided.
TBH I think our role is to educate our DGC not to dumb down our own use of language because of their lack of understanding. I am puzzled why you claimed you didn't understand the use of the word when it was your 6 year old DGS who needed the explanation. 
Someone needs to go back to Junior School himself.
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