A scholarly study of French phraseology, this work examines how fixed and semi-fixed expressions function within the French language. It focuses on the structure, meaning, and use of idioms, collocations, and other recurrent word combinations, situating them within broader linguistic analysis. The book is intended for readers with an academic interest in French linguistics, lexicology, semantics, and language teaching. The study treats phraseological units as important components of vocabulary and discourse, showing how they contribute to fluency, nuance, and cultural meaning. By analyzing patterns of expression in French, it offers a systematic framework for understanding how such units are formed, classified, and interpreted. Useful for students, researchers, and instructors, the volume provides a focused contribution to the study of French as a language system and as a medium of communication.