Definition of entrench verb from the Oxford Advanced Learner's Dictionary

 

entrench

 verb
(also intrench)verb
BrE BrE//ɪnˈtrentʃ//
 
; NAmE NAmE//ɪnˈtrentʃ//
 
Verb Forms present simple I / you / we / they entrench
BrE BrE//ɪnˈtrentʃ//
 
; NAmE NAmE//ɪnˈtrentʃ//
 
he / she / it entrenches
BrE BrE//ɪnˈtrentʃɪz//
 
; NAmE NAmE//ɪnˈtrentʃɪz//
 
past simple entrenched
BrE BrE//ɪnˈtrentʃt//
 
; NAmE NAmE//ɪnˈtrentʃt//
 
past participle entrenched
BrE BrE//ɪnˈtrentʃt//
 
; NAmE NAmE//ɪnˈtrentʃt//
 
-ing form entrenching
BrE BrE//ɪnˈtrentʃɪŋ//
 
; NAmE NAmE//ɪnˈtrentʃɪŋ//
 
 
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[usually passive] entrench something (sometimes disapproving) to establish something very firmly so that it is very difficult to change Sexism is deeply entrenched in our society. entrenched attitudes/interests/opposition This idea had firmly entrenched itself in his consciousness. Word Origin mid 16th cent. (in the sense ‘place within a trench’): from en-, in- ‘into’ + trench.
See the Oxford Advanced American Dictionary entry: entrench