The phrase "in succession" refers to something that happens one after the other without any interruption. There are several synonyms for this phrase, including consecutively, continuously, in a row, without a break, and back-to-back. Other alternatives to "in succession" include one after another, in sequence, following one another, and in a line. These words can be used in various contexts, such as sports events, where teams can win games consecutively; in music, where songs can be played in sequence, or in business, where a company can report quarterly earnings back-to-back. Regardless of the context, the use of these synonyms adds variety and nuance to your language.