What is the "Catcher in the Rye"?

The “Catcher in the Rye”

As the source of the book’s title, this symbol merits close inspection. It first appears in Chapter 16, when a kid Holden admires for walking in the street rather than on the sidewalk is singing the Robert Burns song “Comin’ Thro’ the Rye.” In Chapter 22, when Phoebe asks Holden what he wants to do with his life, he replies with his image, from the song, of a “catcher in the rye.” Holden imagines a field of rye perched high on a cliff, full of children romping and playing. He says he would like to protect the children from falling off the edge of the cliff by “catching”them if they were on the verge of tumbling over. As Phoebe points out, Holden has misheard the lyric. He thinks the line is “If a body catch a body comin’ through the rye,” but the actual lyric is “If a body meet a body, coming through the rye.”
The song “Comin’ Thro’ the Rye” asks if it is wrong for two people to have a romantic encounter out in the fields, away from the public eye, even if they don’t plan to have a commitment to one another. It is highly ironic that the word “meet” refers to an encounter that leads to recreational sex, because the word that Holden substitutes—“catch”—takes on the exact opposite meaning in his mind. Holden wants to catch children before they fall out of innocence into knowledge of the adult world, including knowledge of sex.