Tempo rubato is an expression used in music to indicate a flexible, expressive rhythmic interpretation. It involves the performer deviating from the written tempo to convey a sense of fluidity and feeling in the music. Some synonyms for tempo rubato include "expressive tempo," "free tempo," "elastic tempo," and "flexible rhythm." Other similar terms include "agile," "graceful," and "playful." Tempo rubato is often used in romantic music to convey a sense of emotion and spontaneity in the performance. It is an important technique for musicians to be familiar with, as it allows them to add their own personal touch to the music they are playing.