Truth-Telling and Make-Believe

Kramer in comment on "Invention of Lying":

"in idiomatic English, one "tells the truth" only when one says what one correctly believes is so in a case where lying is an option."

Excellent piece of what Grice would have as 'linguistic botanising'.

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Oddly, make-belief is another (piece) there. It seems people, in idiomatic English, use 'make-belief' as in make-believe-WRONG. So we seem to have a case where what perhaps was an 'implicatum' at some point -- of the conversational kind -- became 'conventionalised' or 'idiomatic'. Or something.