convoy vs pal around with

convoy

verb
  • To travel under convoy. 

  • To escort a group of vehicles, and provide protection. 

noun
  • The act of convoying; protection. 

  • A group of vehicles travelling together for safety, especially one with an escort. 

  • One or more merchant ships sailing in company to the same general destination under the protection of naval vessels. 

pal around with

How often have the words convoy and pal around with occurred in a corpus of books? (source: Google Ngram Viewer )