solo vs unchaperoned

solo

adj
  • Without a companion or instructor. 

  • Of, or relating to, a musical solo. 

adv
  • Alone, without a companion. 

noun
  • A job or performance done by one person alone. 

  • A piece of music for one performer. 

  • A card game similar to whist in which each player plays against the others in turn without a partner 

  • A single shot of espresso. 

  • An instance of soloing the football. 

verb
  • To perform something in the absence of anyone else. 

  • To drop the ball and then toe-kick it upward into the hands. 

  • To perform a solo. 

unchaperoned

adj
  • Not chaperoned; not having a chaperone 

How often have the words solo and unchaperoned occurred in a corpus of books? (source: Google Ngram Viewer )