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up (one's) alley
Well suited to one's interests. I really like Romantic poetry, so this class on John Keats should be up my alley. I'm sure Dave can fix your car—mechanical things like that are really up his alley.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
up (one's) alleyInformal
Compatible with one's interests or qualifications: an assignment that is right up your alley.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.