The technique of twisting the ankle of someone already down, in order to keep them down, under the painful threat of an injury to their ankle that will mar them for life.

(idiomatic) To come into conflict.

(astronomy) Subject to tidal locking.

plural of lock in

plural of lock-weir

(dated) combination lock

A waste weir for a canal, discharging into a lock chamber.

plural of lock out

Alternative form of sidelock

The loss of one degree of freedom in the three-dimensional rotational movement of a three-gimbal mechanism, which occurs when the axes of two of the three gimbals are driven into a parallel configuration, so that the system's rotational movement becomes two-dimensional (and necessarily remains so until an appropriate force is applied); the equivalent situation in a simulation of rotational movement, when the mathematical model uses Euler angles (representing pitch, yaw and roll) or their equivalent.