Keying up is defined as becoming nervous, anxious or excited. Antonyms for keying up can be terms like calming down, relaxing or soothing. These words indicate a decrease in the level of arousal or agitation. For example, if you're feeling keyed up before a performance or an interview, you can try meditating or practicing deep breathing exercises to calm down. Other antonyms for keying up may include "unwinding," "loosening up," "chilling out," or "heading towards serenity." By using these words as a guide, individuals can better understand how to relieve stress and anxiety and promote a greater sense of calm and peace.