Learning my native language

Today I was quizzing a boy on his English vocabulary, using a book that the local school had given out. The topic was "parts of the body." After "chin" and "cheek" came the word "chap." I had never heard it other than as referring to a man. I asked the boy what it meant and he gestured at his face. Hmmm, okay. I got home and had to look in the dictionary. Can you locate a chap?