Others are right on the line. Robo advisors Betterment LLC and Wealthfront Inc. are each sitting at $700 million, and online money transfer startup WorldRemit has a valuation of $500 million.
1 Answer
Here 'right on the line' means 'at a threshhold' of some kind. The exact meaning depends on the context of the article, but the phrase implies the 'others' could go one way or the other.