The antonyms for the phrase "slapping down" can be quite varied, depending on the context. One possible antonym is "lifting up," which suggests a positive, supportive action. Other options might include "encouraging," "praising," "applauding," or "supporting." Another antonym could be "ignoring," which implies a lack of attention or response to a negative action. Other possible antonyms might include "forgiving," "tolerating," or "reconciling," all of which suggest a willingness to overlook negative behavior or to seek a resolution to a conflict. Ultimately, the antonym for "slapping down" will depend on the specific situation and the intention behind the action.