On the back foot is a phrase used to describe a situation where someone is in a difficult or defensive position. There are several synonyms for this phrase, including: on the defense, in a tough spot, struggling, under pressure, in trouble, on the ropes, and at a disadvantage. Each of these phrases conveys a similar meaning to on the back foot, and can be used interchangeably in different contexts. Whether you are playing sports, negotiating a business deal, or dealing with a personal situation, it's important to recognize when you are on the back foot so you can take steps to regain control and turn the situation in your favor.