The word "over-extend" implies excess or exhaust, which is why finding its antonyms can be quite challenging. However, some words that can be used as antonyms for "over-extend" include "limit," "restrict," "restrain," and "moderate." By setting limits and exercising self-restraint, we can avoid overextending ourselves physically, emotionally, and financially. Moderation can help us find balance in our lives and prevent us from taking on more than we can handle. Additionally, delegation and prioritization can also help us avoid overextending ourselves and ensure that we are making the most out of our time and resources.