preach down

基本解释

One should not preach down criticism.
一个人不应该贬低批判。
Sitting down, he began to preach the Gospel message.
坐下后开始传讲福音。
gbicp.org
Article 130 Lawyers and law firms may not preach down other lawyers or law firms and their services in the lawyer's advertisements they publicize.
第一百三十条律师和律师事务所发布的律师广告不得贬低其他律师或律师事务所及其服务。

Mr Bingham invited television cameras into his church on Sunday morning to hear him preach that any march down the Garvaghy Road would be a hollow victory in the shadow of three coffins.
ECONOMIST: From forward march to retreat
Many times in the week, militant blacks—in town from distant parts to preach their particular form of racial separatism—were shouted down not by whites but by blacks, who said they abhorred violence and vengeance.
ECONOMIST: Race relations