One of the mysteries of the English language finally explained.
1Of a military position or force: securely defended by a trench or trenches; well dug-in; (more generally) well-defended against attack.
2Firmly established; difficult to challenge or dislodge; (hence) unlikely to change.
Late 16th century; earliest use found in William Garrard (d. 1587). From well + entrenched.
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