museum piece 
noun
1An object that is worthy of display in a museum: a stunning museum piece from the 18th century...
- The question is simply this: should great passenger ships, when they come to the end of their working life, be saved and turned into a museum piece or consigned to the breaker's yard to be fondly remembered as they were in their heydays?
- Today, the station is being maintained by London Underground mainly as a museum piece, film set and the ticket hall is frequently rented out for art exhibitions, book launches and other private parties.
- The notable museum piece, the Endrick pike head, was found in 1334 near the River Endrick, a tributary of Loch Lomond, and its owner is estimated to have been well in excess of 70 lb.
1.1A person or thing regarded as old-fashioned, irrelevant, or no longer useful: we’re nothing but museum pieces—machines can do everything that we can do...
- Most of the beautiful traditional songs might be museum pieces now, but the impulse to stamp your own identity on play is still there.
- They have machine guns and repeating rifles, not the bolt-action museum pieces I've seen your islanders lugging about.
- The place was a relic, a museum piece, preserved like a man who stops shopping for clothes the day he retires and spends the next thirty years living in limbo and the same pair of nylon trousers.
- checkside goal
- checkside punt
- check someone in
- check someone/thing out
- check something in
- check something off
- check something over
- checksum
- check through
- check-up
- check up on
- check valve
- Cheddar
- cheddi
- cheder
- chedi
- cheechako
- chee-chee
- cheek
- cheekbone
- cheek by jowl
- cheeked
- cheekily
- cheekiness
- cheekpiece