Synonyms that are in the dictionary are marked in green. Synonyms that are not in the dictionary are marked in red.
Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
It’s designed to make it easier to use your iPhone handsfree, so you can stay connected without having to constantly check your phone.
Source: https://www.devicemag.com/how-to-turn-off-text-announcement/