Google Mail incorrectly marks 'another think coming' as grammatical error

I’m curious about when exactly Google Mail started doing this with its built-in grammar checking feature. The system automatically highlights the word ‘think’ in this particular phrase and treats it as completely incorrect. When I right-click on the flagged word, it only gives me the option to replace it with ‘thing’ without any explanation or context about why it thinks this is wrong. I’ve been using this expression for years and I’m pretty sure it’s correct in this context. Has anyone else noticed this happening? It seems like the grammar checker might be missing some nuances of English idioms and expressions. I’m wondering if there’s a way to report this as a false positive or if I should just ignore these suggestions when I know the grammar is actually fine.

this drives me crazy too! Gmail’s spellcheck doesn’t get that both versions are correct. ‘Another think coming’ is actually the original - it comes from ‘if you think that, you have another think coming.’ the ‘thing’ version caught on later but that doesn’t make the original wrong.

yeah, totally! it’s like the checker only knows the newer versions and ignores the classic ones. so annoying when it flags things that are legit. some phrases just have that historical flavor, you know? it’s all about context.