strap down
To fasten or secure someone or something down (to something) with or as with straps. A noun or pronoun can be used between "strap" and "down." Make sure you strap down that cargo before you start driving. They strapped the spy down to a table to begin some advanced interrogation techniques.
strap someone or something down
to tie or bind someone or something down to something. The nurses strapped Gary down in preparation for the operation. They strapped down the patient and gave him a sedative.