Tedding is the process of turning over hay in order to dry it and aerate it properly. If you're looking for synonyms to describe this action, there are several options available. One term that's sometimes used is "fluffing," which conveys the idea of lifting up the hay and shaking it out a bit. Another option is "tossing," which is a bit more forceful and suggests a more aggressive motion. You could also use "raking" to describe the process of pulling the hay apart with a rake in order to expose more of it to the sun and wind. Ultimately, each of these synonyms denotes a similar, if not identical, process to tedding.