Verbal Behavior: Extended Edition. Chapter 12: The Autoclitic. Quote 33

Another kind of autoclitic affects the reaction of the listener by indicating the kind or degree of extension of a tact. When we respond to a novel stimulus with a response under the control of the contingent property, although the stimulus is otherwise unusual, we indicate the extension with such an autoclitic as sort of or kind of (It’s a kind of chair or It’s a sort of brown). (p. 328)