v.1. To fix or hold someone or something in place with a cord, rope, or strap: We tied down the deck chairs so they wouldn't blow away. I tied the luggage down so that it wouldn't fall off the roof of the car.
2. To restrict someone or something in movement: Our new baby has really tied us down—we haven't eaten out for dinner in months. The rebels have tied down the government troops in the mountains, leaving the capital vulnerable to attack. I'd like to travel more, but unfortunately, I'm tied down with a job.