strap on to

strap something on to someone or something

 and strap something on
to tie or bind something onto someone or something. The hiker strapped the load onto her partner. She strapped on the backpack.
See also: on, strap
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • strap (someone or something) onto (someone or something)
  • strapping
  • tighten (something) onto (something else)
  • stitch (something) onto (something else)
  • stitch onto
  • hook (something) onto (someone or something)
  • back onto
  • back onto (something)
  • tack (something) onto (something else)
  • tack onto