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An initialism of "I seem to remember/recall," used primarily in text messages or online communications. To answer your question, DIYdude1989, ISTR that you need a 48V for that size of motor, but I could be wrong. A: "Hey, ISTR you saying you had an extra copy of Pride and Prejudice I could borrow?" B: "Yep, I'll bring it for you tomorrow."
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.