right up one's alley, to be

right up (one's) alley

Ideally suited to one's interests. Anna loves watching movies, so I'm sure she'll go to the film festival with you—that's right up her alley. This course seemed right up my alley when I signed up for it, but it ended up being dreadfully boring.
See also: alley, right, up
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

up one's alley

See also: alley, up
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

right up one's alley, to be

To be in one’s particular specialty or to one’s precise taste. The word alley has long been used for one’s special province; Francis Bacon so used it in his essay Of Cunning (1612): “Such men . . . are good but in their own Alley.” Up one’s alley, however, is a twentieth-century turn of phrase. Margaret Carpenter used it in her novel Experiment Perilous (1943): “It isn’t up my alley at all.” See also not my cup of tea.
See also: right, up
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer
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