(also in·trench ) / ɪnˈtrentʃ; NAmE / verb
[ vn ] [ usually passive ] (sometimes disapproving ) to establish sth very firmly so that it is very difficult to change :
Sexism is deeply entrenched in our society.
entrenched attitudes / interests / opposition
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WORD ORIGIN
mid 16th cent. (in the sense place within a trench ): from en- , in- into + trench .