N-SING-COLL [with singular or plural verb]（组织中的）保守派，守旧派 If you refer to a group of people as the old guard, you mean that they have worked in a particular organization for a very long time and are unwilling to accept new ideas or practices. （组织中的）保守派，守旧派 [disapproval]
The old guard did not like the changes that Brewer introduced.
保守派不满布鲁尔推行的这些变革。
He belongs to the ruling Nationalist Party's old guard.