tie (one) down
To constrain, restrict, impede, or limit one's ability to do something or go somewhere. I would love to try something different, but because our rent is so high, I'm tied down to my current job. Once you're tied down with kids, travel anywhere becomes extremely difficult. The company is trying to tie us down with appeals and injunctions to keep the lawsuit from reaching a court.
To support someone through a period of difficulty or scarcity: Dinner is not for three hours, but this apple should tie me over.