 Inferences such as those in (17b) and (18b) are very common. They are, however, substantially different from the inference in (16b) in that the resulting meaning is the lexical meaning of the collocation, similar to that of a compound. Other examples include ‘pocket knife’ vs. e.g., ‘bread knife’, and ‘coffee spoon’ vs. e.g., ‘silver spoon’. It is worth remembering that on Levinson’s account, presumed, salient interpretations can be explained through the principles of rational communicative behaviour summed up as his Q, I and M heuristics (see Section 1.2 and Levinson 1995, 2000). (16b) arises through the Q-heuristic, ‘What isn’t said isn’t’, while (17b) and (18b) arise through the I-heuristic, ‘What is expressed simply is stereotypically exemplified’. Most generally, the defaults that arise through the Q-heuristic exploit a comparison with what was not, but might have been, said. For example, ‘most’ triggers an inference to a denial of a stronger item ‘all’; ‘believe’ triggers an inference to ‘not know’. At the same time, they are all easily cancellable, as (16c) illustrates.