ABSTRACT Since idioms are figurative expressions that do not mean what they literally state and since they are so frequently encountered in both oral and written discourse, comprehending and producing idioms present language learners with a special vocabulary learning problem. Idiom acquisition research, however, has uncovered a number of findings that have pedagogical implications for idiom instruction. This article summarizes these research findings and presents the language teacher with a systematic plan for teaching idioms to native language learners, bilingual students, and foreign language learners.