Double meaning

A double entendre (/ˌdʌbəl ɒnˈtɒndrə/; French pronunciation: ​[dubl ɑ̃.tɑ̃dʁ(ə)]) is a figure of speech or a particular way of wording that is devised to be understood in two ways, having a double meaning. Typically one of the meanings is obvious, given the context whereas the other may require more thought. The innuendo may convey a message that would be socially awkward, sexually suggestive, or offensive to state directly (the Oxford English Dictionary describes a double entendre as being used to "convey an indelicate meaning", whilst Longman Dictionary of Contemporary English defines it as "a word or phrase that may be understood in two different ways, one of which is often sexual").

A double entendre may exploit puns to convey the second meaning. Double entendres generally rely on multiple meanings of words, or different interpretations of the same primary meaning. They often exploit ambiguity and may be used to introduce it deliberately in a text. Sometimes a homophone (i.e., another word which sounds the same) can be used as a pun. When three or more meanings have been constructed, this is known as a "triple entendre", etc.

A person who is unfamiliar with the hidden or alternative meaning of a sentence may fail to detect its innuendos, aside from observing that others find it humorous for no apparent reason. Perhaps because it is not offensive to those who do not recognise it, innuendo is often used in sitcoms and other comedy where the audience may enjoy the humour while being oblivious to its secondary meaning.

...
Wikipedia