go native

[…]for St. Xavier's looks down on boys who ‘go native all-together.’ One must never forget that one is a Sahib, and that some day, when examinations are passed, one will command natives.

[…] we had to stop putting job-hunting colonels in charge of AFPRO detachments in the plants. It almost always happened that they went native and began to represent the contractor rather than the government.