プログレッシブ和英中辞典(第4版)の解説
むすびつく【結び付く】
&fRoman1;〔結び付けられる〕be [get] tied up ((with)) ⇒むすびつける（結び付ける）
&fRoman2;〔関係し合う〕be connected ((with))；be linked ((with))；be tied ((to))；be related ((to))
あの結婚で二つの大財閥が結び付いた
The two great zaibatsu were 「brought together [united] by that marriage.
両事件はどこかで結び付いているに違いない
There is no doubt that the two incidents are connected [linked/related] in some way.
彼の日ごろの仕事ぶりと，この仕事の雑な出来とはどうしても結び付かない
The shoddy way this job has been done just doesn't correspond to the usual standard(s) of his work.