The phrase "spare the rod, spoil the child" is often used to imply that children need discipline in order to become well-behaved adults. However, there are other ways to express this idea without resorting to corporal punishment. Some synonyms for "spare the rod" could include "discipline with love," "lead by example," "set boundaries," "teach consequences," and "encourage positive behavior." It's important to remember that discipline should aim to teach and guide children rather than intimidate or harm them. Therefore, choosing the right words to express this concept can help promote healthy and effective discipline practices for children.