An analysis of the polysemic nature of prepositions in pidgins and creoles (PCs) looks at the analytic nature of PCs and the pervasive variability in their grammars, and then focuses on usage of the preposition "fo" in Anglo-Nigerian Pidgin (ANP), likely borrowed from the English "for." It is argued that while this is not the only preposition in ANP, its usage in various contexts where other more "natural" languages normally employ distinct prepositions can be attributed to the lexical restriction common to PCs. The analysis looks at how "fo" is capable of differential signification when it possesses basically the same sense in all prepositional contexts, and what inherent meaning it has that can explain its semantic versatility. It is concluded that in ANP grammar, while the presence of prepositions could b pertinent in certain contexts, it does not appear to be primary for signification, and that prepositions tend to "grow" in a language as it develops through elaboration, with prepositional specialization setting in later. It also supports the notion that prepositions are one of the regular victims of language structural reduction, arguing for the role of "fo" as a prepositional jack-of-all-trades. Contains 15 references. (MSE)