Words matter--the more clearly teachers articulate what is to be learned and the instructional practices to be used--the better they teach and their students are more likely to develop knowledge and skills. How can teachers recognize and address the multiple meanings of words in their planning and reflection process? These authors present four practical unpacking strategies to assist in developing shared understanding of underlying ideas, to uncover gaps in grasp of instructional practices, and to prepare lessons with improved clarity and richer opportunities for student learning.