lose [avoid] contact with a person
人との連絡が途絶える[を避ける]
lose contests over territories
領土争いに負ける
lose control of oneself
感情の押さえが効かなくなる
lose currency in the world
世間で通用しなくなる
lose custom
顧客を失う
lose face [interest, sense]
面目[興味,感覚]を失う
lose faith in ...
…を信じなくなる
lose [put on] flesh
やせる[太る](◆lose [put on] weightがふつう)
lose half one's command
部隊の半数を失う
lose heart
気力を失う