If something such as power, a custom, or an idea is entrenched, it is firmly established, so that it would be difficult to change it.
例句
...a series of measures designed to entrench democracy and the rule of law...旨在鞏固民主和法制的一系列措施These dictators have entrenched themselves politically and are difficult to move.這些獨裁者在政治上已經(jīng)站穩(wěn)了腳跟，很難推翻他們。
英漢詞典釋義
adj.
根深蒂固的；牢固的；固守的
Television seems to be firmly entrenched as the number one medium for national advertising.電視看來要在全國廣告媒介中牢固地占據(jù)頭等位置。If the enemy dares to attack us in these entrenched positions,we will make short work of them.如果敵人膽敢進攻我們固守的陣地,我們就消滅他們。