# let us go down
The word "us" is plural even though it refers to God. Some translate it as "let me go down" or "I will go down." If you do this, consider adding a footnote to say that the pronoun is plural. See the note on "Let us make" in Genesis 1:26.
# confuse their language
"mix up their language"
# so that they may not understand each other
"so that they will not be able to understand what each other is saying"