Metaphor is an intriguing concept in the theory of lexical meaning. One-world analyses of metaphor are insufficient. Metaphorical expressions are ambiguous expressions. Metaphorical meaning is nonliteral meaning which utilizes meaning lines drawn by similarity. Metaphor is a vehicle of reference and not of truth. In every metaphorical use of language there is an element of comparison. The similarity it is based on can be of different kinds: qualitative, functional,... The paper deals with the following subjects: mixed metaphors, metaphor and truth and negative statements that are used metaphorically, metaphor and irony, metaphor and context-independence, metaphor as a creative use of language, metaphor and novelty, metaphorical analogy. The study is based on possible-worlds semantics (PWS). (Sabine De Knop)