To shorten(a book or play) by leaving out some parts.
To the lessen the strength or effect of something.
1) They abridged the dictionary by removing rare words.
2) The library's hours have been drastically abridged to cut costs.
Middle English abregen, from Middle-French abreger, from Late Latin abbreviare, from Latin ad- + brevis which means 'short'.
abbreviate, shorten, curtail, cut back, elide
elongate, lengthen, extend, prolong.