Final answer:
In Shakespeare's play Hamlet, the expression 'delve one yard below the mines and blow to the moon' is a metaphorical way of saying that Hamlet exposes Rosencrantz and Guildenstern's true motives and causes their plans to fail.
Step-by-step explanation:
Hamlet delves one yard below the mines and blows Rosencrantz and Guildenstern to the moon is a metaphorical expression used in Shakespeare's play Hamlet.
It means that Hamlet exposes the true motives and intentions of Rosencrantz and Guildenstern, causing their plans to fail and them to suffer the consequences.
In the play, Hamlet sees through their deceit and manipulates them to his advantage, ultimately leading to their downfall.