The story is that I want someone to come earlier to the dining table as food is hot now but in ten minutes it would not be.
How in American English can I say to someone to come early, as food on the table is getting cold or losing heat?
Your dinner is getting cold will be quite acceptable I think. Dunno if there are any idiomatic synonyms though.
Thank you for your interest in this question.
Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site.
Would you like to answer one of these unanswered questions instead?