go native
(移民、游客)接受当地人的(而放弃自己的)风俗习惯 adopt the customs of the local people and abandon those of one's own
He's emigrated to the USA and gone completely native.他已移居美国,完全成了美国人。
We did not recognize our son when we went to see him in South America, he'd gone completely native, and even his speech was difficult to understand.我们到南美去看儿子,不认识他了,他过的生活和当地人一样,连他讲的话,我们也不易听懂。