Son gets upset belly with fruit when it’s past its best?

Longman Dictionary of Contemporary English Word definitions in Longman Dictionary of Contemporary English
noun EXAMPLES FROM CORPUS ▪ But we can be reasonably sure that the drug company will not guarantee the potency of the sample beyond its sell-by date . ▪ Could a turkey with a sell-by date of Dec 27 really be off by Dec 25? ▪ Do women broadcasters have a ...

Wiktionary Word definitions in Wiktionary
n. 1 The final date on which a perishable product can be legally sold to the public. 2 (context idiomatic by extension English) Used to indicate that something, or someone, is old and out of date.

WordNet Word definitions in WordNet
n. a date stamped on perishable produce indicating the date by which it should be sold