Final answer:
The definition of 'to burn down' is to intentionally set fire to a structure. It is a literal meaning related to arson or the act of setting fire to a building or any structure.The correct definition of the phrase 'to burn down' is B) To intentionally set fire to a structure.
Step-by-step explanation:
The correct definition of the phrase 'to burn down' is B) To intentionally set fire to a structure. This means that when something is burned down, it refers to the act of deliberately setting fire to a building or any other structure. It does not mean to increase in temperature, to memorize something, or to experience heartburn.
'To burn down' has a literal meaning in English, specifically related to arson or the act of setting fire to a structure. It is important to understand this phrase in its proper context to avoid any confusion or misconceptions.
For example, if a news article reports that a house burned down, it means that the house was intentionally set on fire and destroyed.