I'll let you go

I'll (have to) let you go

A phrase said to facilitate the end of an interaction with someone, often over the phone. It sounds pretty busy there, so I'll let you go. Call me tomorrow, OK? Sure, I'll let you go, but let's make a lunch date soon. Not that running into you in the grocery store isn't lovely!
See also: go, let
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

I'll (have to) let you go.

Fig. It is time to end this phone conversation. Well, I'll let you go. It's getting late. I have to go to work early tomorrow, so I'll let you go.
See also: go, let
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
See also:
References in classic literature ?
"Ah!" he returned, "I'll let you go. I'll let you go to the moon, I'll let you go to the stars.
"I neither put down king, nor set up king," said Sancho; "I only stand up for myself who am my own lord; if your worship promises me to be quiet, and not to offer to whip me now, I'll let you go free and unhindered; if not-
"As a political candidate, I'll go with how people feel, and I'll let you go with the theoreticians," he said.
"As a political candidate, I'll go with how people feel and I'll let you go with the theoreticians," he said.
[Tomorrow, I'll let you go to China and Hongkong, see for yourselves what kind of (life) the communists are living.
First, I'm required to say, "Expect vectors across final for (spacing/sequencing/etc.)." Next, I'll let you go at least three quarters of a mile past the final, and then give you a 180 degree turn back towards it.
I don't know what had gone on but eventually I got a phone call at 10.15pm and Mike said 'I'll let you go on loan until the end of the season'.
Alternatively come and sing at our mayoral Christmas carols on December 7 for an hour and I'll let you go."
WATSON ALICE September 7, 2012 Aged 81 years MUM I have cried so much my tears are dry,I sit here and wonder why.My heart it pains just for you oh mum I don't know what to do.But I'll let you go to our family but mum please think of me.
But later works like I'll Let You Go, Memorial and The Chrysanthemum Palace demonstrated that he also had a lot more octaves as a writer that he could also write with tenderness and earnest emotion.
But even I wouldn't attempt to woo a girl by whispering in her ear: "I'll let you go out with me...
If you can tell me a story I haven't heard from speeders before, I'll let you go."
The rampant overuse of that irritating cautionary valediction "Take care", viz users of the mobile phone who sign off - "I'll let you go now.
I was talking with someone on the phone just now, and for what must have been the millionth time it's happened to me alone, I heard my caller suddenly pronounce that tired old benediction: "Well, I'll let you go now."