This podcast episode of "The English We Speak" explains the idiom "around the clock," meaning "all day and all night." The two hosts, Feifei and Phil, discuss the meaning and usage of the phrase, providing examples of its application in various contexts, such as cooking for a large dinner party, wedding planning, and exam preparation. They also note that both "around the clock" and "round the clock" are acceptable and can be used adjectivally. The episode concludes with the hosts highlighting the "around the clock" availability of their own programs.