It isn't low-necked and it does not sweep enough.

Hello everybody.

I have a few questions and I need your help. Would you please help me?

What does sweep mean in ' It isn't low-necked and it does not sweep enough.' It refers to a ball dress.

And my another question, I can't get the meaning of repin call in the following.

The Moffats were very fashionable, and simple Meg was rather daunted, at first, by the splendor of the house and the elegance of its occupants. But they were kindly people, in spite of the frivolous life they led, and soon put their
guest at her ease. Perhaps Meg felt, without understanding why, that they were not particularly cultivated or intelligent people, and that all their gilding could not quite conceal the ordinary material of which they were made. It certainly was agreeable to fare sumptuously, drive in a fine carriage, wear her best frock
every day, and do nothing but enjoy herself. It suited her exactly, and soon she began to imitate the manners and conversation of those about her, to put on little airs and graces, use French phrases, crimp her hair, take in her dresses,and talk about the fashions as well as she could. The more she saw of Annie Moffat's pretty things, the more she envied her and sighed to be rich. Home now looked bare and dismal as she thought of it, work grew harder than ever, and she felt that she was a very destitute and much-injured girl, in spite of the new gloves and silk stockings. She had not much time for repining, however, for the three young girls were busily employed in 'having a good time'. They shopped, walked, rode and called all day, went to theaters and operas or frolicked at home in the evening.

Thanks so much for the help ??.