Adam Clarke on Genesis 39:14

He hath brought in a Hebrew unto us - Potiphar's wife affects to throw great blame on her husband, whom we may reasonably suppose she did not greatly love. He hath brought in - he hath raised this person to all his dignity and eminence, to give him the greater opportunity to mock us. לפחק letsachek, here translated to mock, is the same word used in Gen 26:8, relative to Isaac and Rebekah; and is certainly used by Potiphar's wife in Gen 39:17, to signify some kind of familiar intercourse not allowable but between man and wife.