Слово "assist". Англо-русский словарь Мюллера

Upon which the stranger asked his name, and learning that it was Porthos, and not d'Artagnan, he assisted him to rise, brought him back to the hotel, mounted his horse, and disappeared."

and who would come out and sort of invisibly assist the artist with their work

If I required assistance, you'd assist me; that's what YOU'D do.

Of my own accord I could not have stirred; I was paralysed: but the two great girls who sit on each side of me, set me on my legs and pushed me towards the dread judge, and then Miss Temple gently assisted me to his very feet, and I caught her whispered counsel—

“I was half-dragged up to the altar, and before I knew where I was I found myself mumbling responses which were whispered in my ear, and vouching for things of which I knew nothing, and generally assisting in the secure tying up of Irene Adler, spinster, to Godfrey Norton, bachelor. It was all done in an instant, and there was the gentleman thanking me on the one side and the lady on the other, while the clergyman beamed on me in front. It was the most preposterous position in which I ever found myself in my life, and it was the thought of it that started me laughing just now. It seems that there had been some informality about their license, that the clergyman absolutely refused to marry them without a witness of some sort, and that my lucky appearance saved the bridegroom from having to sally out into the streets in search of a best man. The bride gave me a sovereign, and I mean to wear it on my watch chain in memory of the occasion.”

At the very beginning of the seventeenth century it underwent a siege of three weeks and lost 13,000 people, the casualties of war proper being assisted by famine and disease.

In fact, as we have said, the whole camp was in motion. More than two thousand persons had assisted, as at a spectacle, in this fortunate but wild undertaking of the four friends—an undertaking of which they were far from suspecting the real motive.