Accent in poetry refers to the stressed portion of a word. For example:
Now depending on where you place the stress in this poem you will get a different meaning. For example, place the stress or accent on 'Our' and suddenly we have more than one God. Place it on 'them' then, there would appear to be a lot of men already there ready to receive planetary rights. Place it strategically on 'fish', 'birds', 'cattle' then you've got a really nice wrap up with accenting the last 'earth' for emphasis. Of course, where to accent in poetry can be of hot debate.
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