Psycholinguistic research has shown that people's tacit knowledge of conceptual metaphors, such as ANGER IS HEATED FLUID IN A CONTAINER, partly motivates how they make sense of idiomatic phrases like blow your-stack and flip your lid. But do people quickly access conceptual metaphors each time an idiom is encountered in discourse? The present studies used a priming method to examine the role of conceptual metaphors in immediate idiom comprehension. Experiment 1 showed that people access conceptual metaphors when understanding idioms, but significantly less so when processing literal paraphrases of idioms. Experiment 2 demonstrated that people access the appropriate conceptual metaphors, such as ANGER IS HEAT, when processing some idioms, such as blow your stack, but not when they read idioms, such as jump down your throat, which have similar figurative meanings that are motivated by different conceptual metaphors (e.g., ANGER IS ANIMAL BEHAVIOR). The findings from these studies provide important evidence on the constraining role that common patterns of metaphoric thought have in figurative language understanding. (C) 1997 Academic Press.