This paper focusses on the concept of 'grammatical metaphor' as it is conceived of in the framework of systemic functional linguistics. After an illustration of major sub-types of grammatical metaphor, the concept is explained in relation to lexical metaphor, using onomasiological and semasiological perspectives as two complementary viewpoints on metaphorical meaning in general. Figures. Adapted from the source document (LLBA, Accession Number 200703751, (c) CSA [2007]. All rights reserved.)