There are several synonyms for the phrase 'dismiss from use', including 'discard', 'abandon', 'retire', 'phase out', 'relegate', 'eliminate', and 'remove'. When something is no longer useful, it must be disposed of or replaced with something more efficient. For instance, old technology can be discarded or phased out to make room for new and more innovative inventions. Similarly, a product or service that is no longer in demand can be eliminated or retired to make way for new offerings. No matter what the reason for dismissal, there are many synonyms available for communicating the idea of discontinuing use.