What is a pun in poetry?

Using the polysemy of words and homophonic (or homophonic) conditions, it is intended to make a sentence have double meanings, that is, puns.

Puns can make language express implicit humor, deepen meaning and impress people.

There are often puns in Yuefu poems in the Southern Dynasties, such as "Midnight Song": Break up tonight, when will we meet again? Bright light shines on the empty board, and the time is not long. ("period" and "chess" are puns)

I miss happiness, my behavior is based on love, the fog reveals the hidden lotus, but I can't see the lotus clearly. ("Lotus" and "pity" are puns)

Compassion and good feelings moved to the village. In front of Tung Shusheng, I went in and out to see Wu Zixu. ("Wuzi" and "Wuzi" are puns)

Sunrise in the east and rain in the west, the road is sunny (sentimental) and sunny (sentimental). -Liu Yuxi

(1) Lower your head to get the lotus seeds, which are as clear as water. Lotus-pity, purity-affection.

(2) Sunrise in the east and rain in the west, the road is sunny but sunny. A clear feeling

Silkworms in spring will weave until they die, and every night candles will cry dry the wick. Silk thinking

4 lotus seeds are bitter in heart and pears are sour in stomach. Lotus-pity, pear-parting

(5) Light a candle at the bottom of the well. Candle-indicating, going-expired