lip-locking的解釋

Lip-locking
An aggressive behavior seen when two fish face each other and grab each other's mouth. This may last for seconds or minutes. It is used as a test of strength and willingness to hold position. Territorial cichlids will lip-lock with neighbors to assert boundaries. Potential spawning partners will lip-lock to test each other prior to mating. Lip-locking often leads to minor lip damage that will heal within a few days, though occasionally it can lead to more serious problems like a dislocated jaw.

But some people use "lip-locking" as "kissing passionately