Ebb away refers to a gradual decline or fading of something, and its antonyms are related to growth, increase or intensification. Some of the antonyms for ebb away include 'swell up,' 'escalate,' 'thrive,' 'flourish,' 'amplify,' and 'multiply.' While ebb away signifies a decrease in something, the antonyms denote a progression, advancement or enhancement. The antonyms are often used in positive contexts, to indicate the development, expansion, or augmentation of something. For example, a business could be thriving instead of ebbing away, and a person's health could be improving instead of gradually declining. Understanding antonyms can help in communication, writing, and building vocabulary.