allout-kill-topic
    
    allout-kill-topic is an interactive compiled Lisp function in `allout.el'.
(allout-kill-topic)
Kill topic together with subtopics.
Trailing whitespace is killed with a topic if that whitespace:
 - would separate the topic from a subsequent sibling
 - would separate the topic from the end of buffer
 - would not be added to whitespace already separating the topic from the
   previous one.
Topic exposure is marked with text-properties, to be used by
`allout-yank-processing' for exposure recovery.