This article is a reflection on the various areas of cognitive linguistic research on metonymy that are of potential relevance for SLA. Three of them are particularly relevant: (1) research on metonymy-guided inferencing; (2) research on metonymy-based lexical polysemy, and (3) research on metonymy-based grammatical constructions. Of the three main areas with which the paper is mainly concerned, area (1) is particularly relevant for research on second language comprehension, especially in utterance and discourse types heavily relying on the inferential work of the comprehender; area (2) has already proved to be very useful for research on the inferencing strategies followed by second language learners in their comprehension of new lexical senses in context; and area (3) should be helpful for research on the acquisition of grammatical constructions by these learners.