片腕(かたうで)one arm, one's right-hand man, one's right hand

副社長(ふくしゃちょう)は社長(しゃちょう)の片腕(かたうで)として働(はたら)いています。

The vice president is working as the president's right-hand man.

事故(じこ)のせいで片腕(かたうで)を失(うしな)ったが、もう一方(いっぽう)の腕(うで)はある。

Due to the accident, I lost one arm, but I still have the other arm.

僕(ぼく)は両腕(りょううで)ありますが、弟(おとうと)は生(う)まれつき片腕(かたうで)しかありません。

I have both arms, but my younger brother was born with only one arm.

知事(ちじ)の片腕(かたうで)となって県政(けんせい)に尽(つ)くしてきた彼女(かのじょ)が次(つぎ)の知事(ちじ)になるらしい。

It seems that the woman who has been serving as the governor's right-hand man in the prefectural government will become the next governor.

筋肉(きんにく)のない僕(ぼく)にはどうせ片腕(かたうで)で腕立(うでた)て伏(ふ)せをすることなんて出来(でき)ないでしょう。

For someone like me with no muscles, there's no way I could do a push-up with just one arm.