Here are some examples of idioms that can be used in poetry:
* A piece of cake: This idiom means something that is easy to do. It can be used in poetry to describe a simple task or to convey a sense of accomplishment.
* The elephant in the room: This idiom means an obvious problem or issue that is being ignored or avoided. It can be used in poetry to draw attention to a difficult topic or to create a sense of tension.
* Once in a blue moon: This idiom means something that happens very rarely. It can be used in poetry to describe a special or unique event, or to convey a sense of wonder or awe.
* A dime a dozen: This idiom means something that is common or plentiful. It can be used in poetry to describe something that is not valuable or special, or to convey a sense of disappointment or frustration.
Idioms can be a powerful tool for poets to use in their writing. They can help to create vivid imagery, to express complex emotions, and to convey hidden messages. By using idioms in their poetry, poets can add depth and complexity to their language and create works that are both meaningful and memorable.