#his master

"Joseph's master." This refers to Potiphar.

#She told him this explanation

"She explained it like this"

#brought to us

The word "us" refers to Potiphar, his wife, and includes the rest of the household. (See: [[:en:ta:vol2:translate:figs_inclusive]])

#came in to mock me

"came in to make a fool of me." Here, the word "mock" is a euphemism for "to seize and to sleep with." AT: "came into where I was and tried to force me to sleep with him" (UDB) (See: [[:en:ta:vol2:translate:figs_euphemism]])

#It came about that

"Then." Potiphar's wife uses this phrase to mark the next event in the account she is telling him about Joseph trying to sleep with her. (See: [[:en:ta:vol2:translate:writing_newevent]])

#fled outside

"ran quickly out of the house"