Answer: seesout

AnswerCrossword Clue
SEESOUTSticks with, as a task
SEESOUTEscorts to the door
SEESOUTShows to the door
SEESOUTRemains with until completion
SEESOUTFinishes.
SEESOUTParticipates in, to the bitter end.
SEESOUTParticipates to the end.
SEESOUTFinishes, as a project
SEESOUTStays until the end of
SEESOUTUshers to the exit