bind (something or someone) down
To anchor or fasten something or someone in place. You need to bind down the shed in the back yard before the big storm. Can you please bind down the baby in her highchair?
bind someone or something down
to tie or secure someone or something to something. Bind the tarpaulin so it won't get away. We will bind down the patient tightly. They bound the hatch down so it could not be opened.