Fling up (one's) arms in (some emotion) phrase
To move one's arms upwards in a forceful and sudden manner to make a particular emotion of yours known to someone else.
The teacher flung up his arms in despair when the students kept running around and not sitting down.
'I don't want to argue with you anymore!' said Mary, then flung up her arms in resignation and walked off.
The witness saw the victim fling up his arms in horror before getting shot by the murderer.
The verb "fling" must be conjugated according to its tense.
The origin of this phrase is not clear.
To quit; to give up, stop doing something because you know that you cannot succeed; admit defeat
The team is not going to throw in the towel just because they lost one game.