Here are some possibilities:
* If the word "feign" is at the beginning of a page: The guide word on the previous page would likely be a word ending in "f" or "g".
* If the word "feign" is in the middle of a page: The guide word on the same page, before "feign", might be "feeble" and the guide word after "feign" might be "feline".
* If the word "feign" is at the end of a page: The guide word on the next page would likely be a word beginning with "h".
To find the exact guide word, you'll need to refer to the specific dictionary you are using.