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