How to Use "chink" with Example Sentences

1. But there is a chink in this argument .
2. There is a chink in the cag 's constitutional armour , though .
3. If that is true , then is this a sign that the once mighty relational database finally has a chink in its armor ?
4. Modern physicists , aware of the hubris of their 19th-century predecessors , have never thought their subject closed . But nor have they found a chink in the armour of relativity that they could use to prise the whole thing open .