To be the best or most outstanding; to be second to none.
首首先。扳指头计算，首先弯下大拇指，表示第一。指居第一位。引申为最好的。
闻一多《家书——给父母亲》此校确系美国之首屈一指，我毕业于此后，纵欲继续研究，在此邦亦无处可去也。”
In the field of scientific research, she is second to none.
Learn the next connected idiom: 首屈一指 (shǒu qū yī zhǐ) → 指日可待 (zhǐ rì kě dài)
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