To begin to be, or to act as.
To begin, start.
To become trained or conditioned in a pattern of brain behavior.
To suspend small particles in the current of a fluid.
To get into or board a railway train.
To put aboard a railway train.
To draw along as a current does.
To set up or propagate a signal, such as an oscillation.
To encarriage, to conjoin, to link; as in a series of entities, elements, objects or processes.