1. The expression Ballpark figure is an American slang term that means an estimate or guesstimate

2. Beguess foreguess guessable guesser guessing game guesstimate guess what guesswork keep someone guessing no prize for guessing out-guess second-guess you'll never guess 語源 2 From Middle English gesse

3. Why else declare what is, after all, only a guesstimate on 31 October, a solemn day of mourning in the Christian calendar and of ghoulish Halloween partying in the Anglo-Saxon world? Sentencedict.com