how can i use the word caustic in a sentence that relates to the book "A Separate Peace"

This dictionary site has definitions and example sentences for "caustic." I'm sure you can modify one of them to relate to the book.

http://dictionary.reference.com/browse/caustic

To incorporate the word "caustic" in a sentence related to the book "A Separate Peace," you would first need to understand the meaning and context of the word. "Caustic" refers to something that is sarcastic, cutting, or harsh in nature. It can also describe an acidic substance that corrodes or burns.

Taking into account the themes and characters of "A Separate Peace," one possible sentence could be:

"The protagonist's internal struggle with jealousy manifested in his caustic remarks, as his bitter words corroded the friendship between him and his best friend."

To create this sentence, you need to first understand the book's plot and the character dynamics. Evaluate instances where a character expresses bitterness, sarcasm, or hostility through their words to illustrate the use of "caustic" accurately.