skeleton key meaning in English

(可以开各种锁的)万能钥匙。

The burglars had used skeleton keys or entered over the balcony .
窃贼或者用了万能钥匙，或者是爬越阳台进入房间的。
Then, he reached into his pocket for skeleton key which he had just had in his hand, but it wasn't there .
接着他把手伸进口袋去掏万能钥匙。他刚才还拿在手里啊，但是现在没有了。
The count soon heard the rattling of a bunch of skeleton keys , such as the locksmith brings when called to force a lock , and which thieves call nightingales , doubtless from the music of their nightly song when they grind against the bolt
伯爵不久就听到一人串钥匙的声音，就是铜匠老是放在身边准备开各种锁的那种钥匙串，这个玩意儿窃贼们称之为“夜莺” ，那无疑是因为开锁的时候它会唱出玎玲当啷的夜曲的缘故。