ex ‧ pir ‧ y /ɪkˈspaɪəri $ -ˈspaɪri/ BrE AmE noun [uncountable] British English
1 . the end of a period of time during which an official document can legally be used, or the end of a period of authority SYN expiration American English
expiry of
the formal expiry of the presidential term in September
Only seven minutes remained before the expiry of the noon deadline.
2 . expiry date the date after which something is not safe to eat or can no longer be used SYN expiration date American English :
Check the expiry date on your passport.
Eggs must be marked with an expiry date that is ten days from the date of packing.
⇨ ↑ sell-by date