Collins COBUILD Advanced Learner's English Dictionary - arr.

1. Arr. is a written abbreviation for arrives. It is used on timetables to indicate what time a bus, train, or plane will reach a place. ...dep. Victoria 1927, arr. Ramsgate 2110. 2. Arr. is a written abbreviation for arranged. It is used to show that a piece of music written by one person has been rewritten in a different way or for different instruments by another person. ‘A Good New Year’, sung by Kenneth McKellar, (Trad., Arr. Knight).