intonation turn
Definition - The point in an utterance when the intonation rises or falls.

1. It is usually at a prominent part of an utterance.

Oxford English Dictionary -
The term's first citation is from 1935:
"If the psychological predicate consists of several words the most important gets the intonation turn."
(M. Schubiger Role of Intonation in Spoken Eng. 9)

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