He had not a peg to hang on and got dumb for some time.

他一点借口也找不出来，楞在那儿好一会儿。

youdao

There's a peg near the door to hang your coat on.

门边有个钩子可以挂衣服。

《牛津词典》

As a peg on which to hang a tour through many parts of the far-flung empire of philosophy, this dilemma is perhaps as promising as any.

他带着这个发人深思的悖论游历哲学王国的广袤疆土。

youdao

Again, it could be a fantastic news "peg" on which to hang a story that you have researched and prepared in advance.

BBC: Story ideas for 2011 News Day

LOST's provisions on prevention of marine pollution from land-based sources could easily serve as a convenient peg on which to hang the greenhouse gas-regulating Kyoto Protocol, even though that treaty has also never been ratified.

CENTERFORSECURITYPOLICY: LOST oil prophets