The phrase "that is to say" is often used to clarify or explain something previously stated. It is spelled as /ðæt ɪz tuː seɪ/ in IPA phonetic transcription. This means that the first word "that" is pronounced with the voiced dental fricative sound /ð/, followed by the short vowel sound /æ/ and the voiceless dental fricative sound /t/. The next two words are pronounced with the short vowel sound /ɪ/ and the voiced alveolar fricative sound /z/. Finally, "to say" is pronounced with the diphthong /tuː/ and the voiceless palato-alveolar fricative sound /seɪ/.
"That is to say" is a commonly used transitional phrase in English language. It is an idiomatic expression that is used to introduce a clarification or a more precise explanation of something that has already been stated. This phrase is often used to restate or summarize a previous statement by providing additional information, examples, or further elaboration.
When used in conversation or writing, "that is to say" indicates that the forthcoming information is intended to provide a clearer understanding or give a more concise explanation of the preceding statement. It is a way of signaling to the listener or reader that the speaker is about to clarify their previous point or provide an example to better illustrate their argument.
For example, consider the sentence: "I enjoy outdoor activities, that is to say, hiking, cycling, and camping." In this context, "that is to say" is used to specify and illustrate the types of outdoor activities that the speaker enjoys. It serves as a way to provide a more concrete understanding of the general statement made earlier.
Overall, "that is to say" acts as a connector that aids in enhancing clarity and comprehension by elaborating or summarizing a previous statement with more explicit or specified information.