How to Concatnate using AWK in UNIX

I was working on a editing a file using AWK, and I want to concat a string to the output in each line, so I came up with this

filename.out contains:
abc def ;
ghi jkl ;
asd fgh ;

awk '{print $2 "="}' < filename.out

Output:
def=
jkl=
fgh=

Don't forget to use the space.

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