'Strange' in the Bible

Then Jacob said unto his household, and to all that were with him, Put away the strange gods that are among you, and be clean, and change your garments:

And they gave unto Jacob all the strange gods which were in their hand, and all their earrings which were in their ears; and Jacob hid them under the oak which was by Shechem.

And Joseph saw his brethren, and he knew them, but made himself strange unto them, and spake roughly unto them; and he said unto them, Whence come ye? And they said, From the land of Canaan to buy food.