The term "over-extension" refers to a situation where individuals or organizations extend their resources beyond their capacity or limits. The antonyms for over-extension include restraint, moderation, and balance. Restraint refers to the act of holding back or limiting oneself, such that they do not go beyond their means. Moderation, on the other hand, implies the avoidance of any extremes, both in action or behavior. Finally, balance denotes an equal distribution of resources or tasks among different entities, such that none is overloaded. By practicing restraint, moderation, and balance, individuals and organizations can avoid over-extension and maintain a healthy and sustainable level of growth and success.