"In a way, once you win, if you don't win again it's sort of like you've lost something", she said prior to competing in Switzerland.
Slovak pair Veronika Velez Zuzulova (+0.59) and Petra Vlhova (+0.76) were next, ahead of Sweden's Frida Hansdotter, Switzerland's Michelle Gisin and Austrian Michaela Kirchgasser.
"It happened nearly as flawless as it could have", Shiffrin said.
Shiffrin's third win in the slalom equalled the record of German Christl Cranz, who completed her treble in 1939.
ST. MORITZ, Switzerland (Feb. 16, 2017) - Mikaela Shiffrin (Eagle-Vail, CO) grabbed her first career World Championships giant slalom medal Thursday, finishing second on a sun-soaked course at the 2017 FIS Alpine World Ski Championships.
"I don't think it's jinxing it, it's not arrogant", Shiffrin said at the time, according to the San Jose Mercury News' Elliott Almond.
She achieved that feat in dominant fashion with a 1.64-second margin of victory.
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Tessa Worley of France took the victory, her second World Championship giant slalom title, as Italy's Sofia Goggia finished third, her first World Championship medal as well.
She said: "There have been lots of challenges but lots of unbelievable days, today was a really good day so I'm happy".
Silver also represented a second medal of the Championships for Holdener after she triumphed in the combined while Hansdotter added to her team event bronze from St Moritz, meaning she has five World medals to her name now.
"I made a few small mistakes in the second run, so when I heard the speaker say I had the lead I was surprised", said Holdener. "That was the way I imagined myself skiing the course". "I'm happy to walk away from here with two medals".
The 2017 FIS Alpine World Ski Championships in St. Moritz concludes Sunday with men's slalom. "I'm just going to try to ride this wave, get a little training tomorrow, and then go out and try to attack on Saturday".
First run I felt like I left something out on the hill, second run I really feel like I attacked.
It was actually really good for the second run. When the World Cup resumes next weekend, she will have a huge lead in the overall standings, a pursuit that should end with her being crowned the youngest World Cup overall champion since 2003.