loose end 
noun
A detail that is not yet settled or explained: Mark arrived back at his office to tie up any loose ends...
- The screenplay was so carefully written that everything is explained, loose ends are tied up.
- Those who like their loose ends tied should probably give it a miss, but if you're prepared to go with the flow, this is thrilling stuff.
- The plot does not follow a straight path whereby all the loose ends are tied up and everything finally starts to make sense.
Phrases
be at a loose end (or at loose ends)
- fiftyfold
- fifty-year rule
- fig
- fig.
- figary
- figbird
- figgy
- figgy pudding
- fight
- fight a losing battle
- fightback
- fighter
- fighter-bomber
- fighter jet
- fighter pilot
- fight fire with fire
- fighting
- fighting chair
- fighting chance
- fighting cock
- fighting fish
- fighting fit
- fighting fund
- fighting top
- fighting words