Because people keep hitting them with dictionaries.
Because they, like, can't even!
Because they can spell it.
Here in the U.S. we just ask them how many grams are in an ounce.
Tresemme 21
Dam(n).
Their only hit was Don't Stop Bereaving.
That thing hurts!
Me! That hurts!
You can see the definition.
Because he wanted to get more definition.