Senses
上纲上线/ 上綱上線 to elevate to the level of principle
to criticize an action by framing it as a matter of political principle or ideological line struggle (PRC political jargon)
上纲上线/ 上綱上線 to make a mountain out of a molehill
to treat a minor issue as a matter of high principle; to blow things out of proportion by applying excessive ideological or moral weight to a small mistake