Prince Andrew, greatly changed and plainly in better health, but with a fresh horizontal wrinkle between his brows, stood in civilian dress facing his father and Prince Meshcherski, warmly disputing and vigorously gesticulating.
There are no more uses of "horizontal" in the book.
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Paintings in which horizontal lines dominate, tend to be relaxing.
The whole thing goes horizontally, too, at least it seems so, and I exhaust myself in trying to distinguish the order of its going in that direction.