I found another informal dictionary of Scottishisms The expression the ball's on the slates , is a Scottish way of saying, the game's up, we're finished . It derives from children's street games ending abruptly when the ball is kicked accidentally onto the roof. All the roofs in Scotland are made of slate, since the material is locally plentiful.
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Henry74Do you find the difference in spelling and grammar not particulary significantIn such localisms, dialectical variation is par for the course.
The phrase means an element of uncertainty has been introduced, as the bal in a game has landed on the roof and it is unsure which part of the roof it will roll down from
It means quite literally - the ball ( football normally ) is on the slates ( ie roof) so the game cannot continue . It means whatever this is referring to is over . It cannot go on . In other words - the games a bogey !!!! .