しっくり行(い)くto get along well with (someone)

僕(ぼく)らは最高(さいこう)の相棒(あいぼう)だ。しっくり行(い)っている。

We are the best partners. We get along well with each other.

夫婦(ふうふ)の間(あいだ)がしっくり行(い)っている彼(かれ)らが羨(うらや)ましいです。

I envy them because they get along well with each other as a married couple.

僕(ぼく)の父親(ちちおや)は堅物(かたぶつ)で、僕(ぼく)と父親(ちちおや)はあまりしっくり行(い)っていない。

My father is a stubborn person, and he and I don't get along well with each other.

夫婦(ふうふ)仲(なか)がしっくり行(い)っていないことを一応(いちおう)義理(ぎり)の母(はは)に相談(そうだん)してみた。

I tried consulting my mother-in-law about the fact that my spouse and I are not getting along well.

上手(うま)く行(い)っていなかった二人(ふたり)がどうやら最近(さいきん)はしっくり行(い)っているそうです。

It seems that the couple, who weren't getting along well, have recently been getting along well with each other.