to tie down
- restrain from independence by an obligation
- I knelt down to tie my shoes.
- Webbings and hardware intended to secure the wheelchair (tie-down mechanisms) shall meet the requirements of Directive 77/541/EEC and of the relevant part of Standard ISO 10542.
- Appropriate information shall be made available to the vehicle owner that a wheelchair used as a seat in the vehicle shall be capable of withstanding the forces transmitted by the tie-down mechanism during the various driving conditions.