Answer: plugging

AnswerCrossword Clue
pluggingInsert (something) into an opening so as to fill it
pluggingShoot or hit (someone or something)
pluggingProceed steadily and laboriously with a journey or task
pluggingBlock or fill in (a hole or cavity)
pluggingstuff which forms a plug
pluggingMention (a product, event, or establishment) publicly in order to promote it