Definition of read-in:
(v) :
(transitive or intransitive) To look at and interpret letters or other information that is written.
(v) :
(transitive or intransitive) To speak aloud words or other information that is written. (often construed with a to phrase or an indirect object)
(v) :
(transitive) To interpret, or infer a meaning, significance, thought, intention, etc., from.
(v) :
(transitive, metonymic) To read a work or works written by the named author.
(v) :
(ergative, of text) To be understood or physically read in a specific way.
(v) :
To consist of certain text.