 Fun fact: the word ‘ambiguous’, at least according to the Oxford English Dictionary, is ambiguous: it can mean uncertainty or dubiousness on the one hand and a sign bearing multiple meanings on the other. I mention this merely to disambiguate what this entry is about, which concerns a word or phrase enjoying multiple meanings. In this sense, ambiguity has been the source of much frustration, bemusement, and amusement for philosophers, lexicographers, linguists, cognitive scientists, literary theorists and critics, authors, poets, orators and pretty much every other being who uses language regularly to communicate.