read (oneself) in
Of a priest in the Anglican church, to assume possession of a benefice (a church office with fixed capital assets and subsequent revenue) by reading the Thirty-nine Articles of Religion and declaring his assent. Primarily heard in UK. A new priest must read himself in within two months of being ordained in order to be granted his new office.
read in
Of a computer, to acquire data from something, such as a program, and enter it into memory or storage. A noun or pronoun can be used between "read" and "in." The command triggers the operating system to allocate virtual memory so that it can read the program in.
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