(off) on a tangent(redirected from Off on a tangent)
(off) on a tangent
Addressing a topic or topics not relevant to the main discussion. I tried to address the customer's problem, but she kept going off on a tangent and I couldn't understand what her true complaint was. In the middle of our conversation about my finances, my advisor went on a tangent about current events.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
on a tangent
On a sudden digression or change of course, as in The professor's hard to follow; he's always off on a tangent. This phrase often occurs in the idioms fly off or go off on a tangent , as in The witness was convincing until he went off on a tangent. This expression alludes to the geometric tangent-a line or curve that touches but does not intersect with another line or curve. [Second half of 1700s]
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.