Question on: WAEC Literature - 1999

Read the extract below and answer the question:

......O, when mine eyes did see Olivia first,
Me thought she purged the air of pestilence;
That instant was, I turned into a hert,
And my desires, like fell and cruel hounds,
E'er since pursue me.
(Act 1, Scene 1)

The figure of speech used in the underlined expression is

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