off-piste
adjective, adverb uk/ˌɒfˈpiːst/ us/ˌɑːfˈpiːst/
偏离滑雪道的
used to refer to skiing that is done on areas of snow that have not been specially prepared for skiing on
It is important that skiers take precautions, especially if they go off-piste. 滑雪者采取预防措施很重要，尤其是当他们偏离滑雪道时。
Idiom
go off-pisteidiom mainly UK humorous不合常规的，意料之外的
to do something different to what is normal or expected
The presenter went off-piste from the script, with hilarious consequences. 主持人脱离了脚本，结果令人捧腹。