The English We Speak: On their toes

This podcast episode, "The English We Speak," features Feifei and another speaker explaining the English idiom "keep someone on their toes." They define the phrase as doing something to ensure a person stays alert and ready for unexpected events, using examples like a boxer or a changing work schedule. They also briefly introduce the related phrase "be on the ball," meaning to be quick to understand or react. The episode includes short examples from different speakers to illustrate the usage of "keep someone on their toes."