The knot in the rope looks like it's about to come undone.
Water is leaking from the joint of this pipe.
The connection between the parts of the story was unnatural.
つなぎ目 refers to the visible seam or point where two things meet, while ジョイント can mean either that connection or the act of joining.
Common spelling using kana for つなぎ and kanji for 目.
Kanji spelling using 繋ぐ; less common but still encountered.
Compound of 繋ぎ (つなぎ, continuative form of 繋ぐ 'to connect, tie') + 目 (め, 'point, spot'). Literally 'connecting point'.