This is the 6648th most frequent Japanese word.
ネック
"ネック" (nekku) refers to a bottleneck, obstacle, or limiting factor in a situation.
The word ネック (nekku) is used here metaphorically to refer to an obstacle or limiting factor impeding progress.
プロジェクトの進行において、この部分がネックになっています。
In the progress of the project, this part acts as a bottleneck.
In this sentence, ネック (nekku) refers literally to the 'neck' of a sweater or its neckline, highlighting its physical design.
このセーターのネック部分がとても気に入っています。
I really like the neck part of this sweater.
ネック (nekku) is again used metaphorically but in a predictive context, discussing anticipated challenges.