Definition:
The word "epicentre" is a noun that refers to the point on the Earth's surface that is directly above where an earthquake starts, known as the focus or hypocenter.
In more advanced discussions, "epicentre" can also refer metaphorically to the central point of any significant activity or interest, not just earthquakes.
There are no widely recognized idioms that include the word "epicentre," but you may come across phrases like "the epicenter of attention," which means the main focus of interest.
There are no specific phrasal verbs directly related to "epicentre," but you might encounter phrases like "to be centered around," which can convey a similar idea in a different context.
In summary, "epicentre" is primarily used in relation to earthquakes to describe the point on the surface above where the earthquake originates.