Mercutio uses personification when he asks Tybalt, "Will you pluck your sword out of his pilcher by the ears? Make haste, lest mine be about your ears ere it be out" (3.1.81-83). He gives the human attribute of possessing ears to Tybalt's sword, asking Tybalt, essentially, to draw his sword from its "pilch," or scabbard, so that they can fight. The second sentence of the quotation employs some wordplay: Mercutio tells Tybalt to draw his sword out by its "ears" quickly otherwise Mercutio will have his own sword at Tybalt's ears before Tybalt is even ready.
When Mercutio describes the wound Tybalt has inflicted upon him, he says it is "a scratch, a scratch" (3.1.97). Here, he employs understatement; it is a great deal more than a scratch as he admits a moment later that it will be "enough" to kill him.
Mercutio uses similes when he describes the wound to Romeo : "'tis not so deep as a well, nor so wide as a church door [...]" (3.1.100-101). Here, he compares the size of the wound's...
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