This paper explores how adults acquire a new lexical item, and how they integrate it into their overall lexical knowledge. It suggests that the findings are relevant both to lexical semantics, and 10 studies of the mental lexicon. In particular, the paper examines how the word wimp and its derivatives (mainly wimpish, wimpishness, and wimp out) have become widely-known in British English in a time-span of around ten years. Wimp-usage predated entry into standard dictionaries, so dictionary consultation is unlikely to have played an important role. This paper therefore analyses a corpus of over 500 occurrences of wimp-words from British newspapers 1990–3, mainly from The Times and Sunday Times, on the assumption that word learning can occur from reading. and that newspaper usage overlaps with ‘normal’ usage. It shows that over 80% of wimp-word tokens contain information on their meaning in the immediate surrounding text. This involved one or more of the following: reference to the sex of the wimp (usually male), collocation with a word indicating feebleness (e.g. ‘paihetic wimp’), contrast with a ‘strong’ non-wimp (e.g. ‘From wimps to warriors’), overt negative evaluation (e.g. ‘reviles as a wimp’). covert negative evaluation (e.g. ‘Who needs an enclosed cockpit? Wimps’). Finally, it argues that ‘the wimp effect’ reinforces the idea that a desirable male is one who is a belligerent action-man, and so promotes and sustains cultural stereotypes. [ABSTRACT FROM AUTHOR]