* A teacher who works across multiple subjects or grade levels: This teacher might teach parts of several subjects within a single grade, or teach the same subject across multiple grade levels. For example, a teacher might teach both science and math to fifth graders, or teach science to fifth and sixth graders.
* A teacher who utilizes crossover skills and knowledge: This describes a teacher who effectively applies knowledge and skills from one subject area to another to enrich their teaching. A history teacher using filmmaking techniques to create engaging lessons, or a math teacher using art projects to illustrate concepts, would be examples.
* A teacher who bridges the gap between different learning styles or modalities: This teacher is adept at catering to diverse learners, employing various teaching methods to effectively reach students with different learning preferences (visual, auditory, kinesthetic).
* A teacher who collaborates across disciplines: This teacher actively works with other teachers from different subject areas to plan and execute integrated curriculum or projects.
In short, "crossover teacher" is a descriptive term, and its precise meaning depends on how it's being used. To understand what someone means by it, you'd need more context.