the [dip] of an old roller coaster

Irelia20150604

Senior Member
Chinese
Source: The Ski Jumpers Of A Small Illinois Town

<At least half of the U.S. men's ski jump team in the 2018 Winter Olympics may come from a flat, unlikely place: suburban Chicago.>

They just piled out of a minivan at the top of a big hill, driving up a winding road past front yards filled with boat trailers and swimming pools. The ski jump towers more than 200 feet off the top of the hill and looks like the dip of an old roller coaster held up by a bare metal frame. At the top, skiers shimmy onto a starting bar, place their skis on the track, lean forward. And...
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Hi everyone! How should I understand "dip" here?
 
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