"a loose end"
a small unresolved problem or difficulty, especially a final detail that needs to be finished in order for a larger project to be completely finished
Related words and phrases:
Two friends are talking ...
Friend 1: I'm not sure I liked that movie.
Friend 2: I agree. What happened to the main character's wife? She went to the store about three-quarters of the way through the movie and we never saw her again.
Friend 1: That is definitely a loose end. Maybe the directors will include her fate in the sequel.
Two colleagues are talking ...
Colleague 1: I think the report is ready.
Colleague 2: Except that there is a loose end.
Colleague 1: What is that?
Colleague 2: We need to produce the report in multiple formats that it can be read on any device.
Colleague 1: You're right. I only saved it in Word format. Guess I will take care of that one last task.
There is no gerund form for a loose end.
1) ... is really her table, or theirs. It's kind of murky. A loose end left hanging over from their separation and divorce.
2) As a sign of loyalty to Nazir, Brody shoots dead Walker, a loose end from their original campaign.
3) ... and did they get them off before it blew up? That was really a loose end and odd.
4) ... which are generally expressed as differential equations for continuous variables, remains a loose end in Turing's argument.
5) ... all the work you had to finish is genuinely finished. Don't let a loose end ruin your relaxation when you are away.
6) That itch didn't come from a loose end in the original script.
7) ... called back to dig into some more unexplained/conspiracy stuff - perhaps pick up on a loose end from a previous episode, then I'd go see a movie.
8) And how are the gorgeous shoes? You left a loose end with that one!
9) Anyone who spots a gap or a loose end in the map or who identifies a new option can add this to the ...
10) Something in the film didn't make sense. A loose end that doesn't tidy itself away neatly.
11) In this respect the fate of Jens Holk is not just a loose end, it lacks credibility.
12) There was a loose end in Excession where the chronology went awry, ...
13) ... pistol and then, once she's been offed, he's just at a loose end.
14) ... other guy hinted at a possible murder of the Parkers, so was this a loose end in what was deleted from the final film?
15) Roark and his 17-year-old girlfriend were killed because Aguigui felt the couple was "a loose end," Burnett said.
16) The experimenters are now pursuing a loose end, a slightly unexpected observation: helium does not accumulate in the outer tube ...
17) ... themselves as the central government over all of Vietnam, the VC would be a loose end.
18) Clanton realizes that Appell is a loose end that needs to be taken care of.
19) It seems that there is not a loose end that Apple didn't take into account during the production of these items.
20) The report even takes care of tying up a loose end that has allowed some commentators to avoid the scientific literature.