rock-solid の英語での意味
rock-solidˌrock-ˈsolid, rock solid adjective 
すべての翻訳を見る1rock-solid things can be depended on and trusted not to change変わることなく頼りにでき、信頼できる: 
a rock-solid guarantee盤石の保証2very hard and not likely to break非常に硬く、壊れにくい
すべての翻訳を見る1rock-solid things can be depended on and trusted not to change変わることなく頼りにでき、信頼できる: a rock-solid guarantee盤石の保証2very hard and not likely to break非常に硬く、壊れにくい