A key card is the plastic card that unlocks a hotel door. Tap the key card.
It stops working if kept next to a phone, which nobody is ever told. A key card is reprogrammed for each guest, so the old ones open nothing.
1nounkey cardThe plastic card that unlocks a hotel door.
“The key card stopped working on the third day.”
key card is a card.
keycard comes from key + card.
Etymology from Wiktionary, CC BY-SA
Practised in Hotel & Staying Away