entrench
词根词缀：
entrench v. 用壕沟防护
en 使… + trench 切，割 → 在地上切割成〔壕沟〕→ 用壕沟防护
retrench v. 削减；节省
re 一再 + trench 切，割 → 一再削减〔开支〕→ 节省
trench n. 壕沟（像被切割出来的 → 壕沟）
trenchant adj. 一针见血的
trench 切，割 + ant …的，具有…性质的 → 像刀切进去一样 → 一针见血的
数据来源：新东方英语词汇速记大全
相关例句：
They understand the law will entrench the rights of the carpet-baggers who have looted the state as it has privatised assets.
他们明白这项法律将确立外来政客们的权利。当国家将资产私有化时，外来政客们也夺取了国家。
A new year looks sure to entrench old resentments.
新的一年肯定会牢固旧有的悔恨情绪。
Newly-enfranchised citizens in the Arab world face the task of building institutions to entrench the rule of law.
阿拉伯世界刚赢得政治权利的公民们，面临着建立制度、巩固法治的任务。
Our monetary regime continues to move Britain towards stable growth and we will consider any necessary reforms to entrench that stability.
我们的货币政策制度，继续推动英国经济保持稳定增长，而我们将会考虑任何必要的改革措施，以巩固这种稳定性。
"Our international education sector is world class, and the reforms announced today will help entrench Australia as a preferred destination for international students," Senator Evans said.
“我们的国际教育院校是世界一流的，今天宣布的改革措施将有助于国际学生将澳大利亚作为留学首选目的国。”埃文斯参议员说。
Some conclude that the Shias have no real intention to share power, only to string America along while using its firepower to destroy rivals and entrench their own dominion.
一些人总结说什叶派其实毫无分享权力的意图，他们只是在糊弄美国人，仰仗美国主子的强大军力，消灭对手，以使其统治更加坚不可摧。