pun
/pʌn; pʌn/ n
~ (on sth) humorous use of a word that has two meanings or of different words that sound the same, eg `She told the child to try not to be so trying'; play on words 双关（语）（利用词的一词多义现象或同音异义现象产生出的词的诙谐用法）
The slogan was a pun on the name of the product. 那广告用语与其产品名称一语双关. pun, v (-nn-) [I, Ipr]
~ (on sth) make a pun or puns (on a word) 使用双关语
He's always punning and I don't find it funny. 他老是使用双关语, 我觉得很没意思.