to make sb oppose a friend, relative, etc.; to judge sth by comparing good or positive qualities with bad or negative ones
set sb against sb
to make sb oppose a friend, relative, etc.
She accused her husband of setting the children against her.
set sth (off) against sth
to judge sth by comparing good or positive qualities with bad or negative ones
Set against the benefits of the new technology, there is also a strong possibility that jobs will be lost.
set sth (off) against sth
to record sth as a business cost as a way of reducing the amount of tax you must pay
to set capital costs off against tax
Definiciones del Oxford Advanced Learner's Dictionary, 9.ª edición