busk vs tie up

busk

verb
  • To tack, cruise about. 

  • To solicit money by entertaining the public in the street or in public transport. 

noun
  • A strip of metal, whalebone, wood, or other material, worn in the front of a corset to stiffen it. 

  • A corset. 

tie up

verb
  • To occupy, detain, keep busy, or delay. 

  • To immobilize a capital: make a capital investment that makes that capital unavailable. 

  • To complete, finish, or resolve. 

  • Don't forget to tie up your hair before you bake. 

  • To secure with rope, string, etc. 

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