He took a short length of rope and swiftly tied a slip knot.
他拿了一小段绳子迅速打了个活结。
《柯林斯英汉双解大词典》
2
If so, they may be able to slip past the velvet rope and into the exclusive dwarf-planet club.
如果是这样的话，那么它们将踏进矮行星俱乐部的门槛。
3
A belay method in which some rope is allowed to slip during severe falls. A dynamic belay can severely reduce the impact force from a serious fall, but can also severely kill you if not done properly.