Final answer:
The phrase 'the calm before the storm' used by Pierre-Joseph is an example of an idiom, which is a figurative expression indicating a quiet period before trouble or activity.
Step-by-step explanation:
Pierre-Joseph's remarks "the calm before the storm" is an example of an idiom. An idiom is a phrase or expression that typically presents a figurative, non-literal meaning attached to the phrase; it does not mean its literal interpretation. The phrase "the calm before the storm" refers to a quiet or peaceful period right before a period of activity or trouble. This idiom is often used to describe a sense of anticipatory tension before a significant event, especially one that is expected to be tumultuous or difficult.