Answer: pretrains

AnswerCrossword Clue
pretrainsto make fit
pretrainsmoving line of persons, vehicles, etc.
pretrainsto aim, as a gun
pretrainsconnected railroad cars pulled by a locomotive
pretrainsto become trained
pretrainsto form the behavior of by discipline and instruction
pretrainsseries of events, ideas, etc.
pretrainspart of a long skirt that trails behind