“…In particular, we ask whether children can exploit lexical flexibility: The systematic use of words to encode multiple, related meanings (Barner & Bale, 2002;Copestake & Briscoe, 1995;Pustejovsky, 1995). For example, many of the same English root morphemes can be used to label instruments, as nouns, and activities involving those instruments, as verbs (e.g., shovel, hammer, mix/mixer, wash/washer;Adams, 1973;Clark & Clark, 1979;Jespersen, 1942;Marchand, 1969; see Table 1 for other examples of lexical flexibility). The present studies explore young children's use of semantic generalizations about lexical flexibility to bypass observational learning: Upon learning one meaning of a new word via observation (e.g., that dax labels an activity), can children spontaneously infer another possible meaning of the word that follows a generalization (e.g., that dax can label the instrument itself)?…”