secondkey
nounUK /ˈsekənd kiː/
US /ˈsekənd kiː/
A secondkey is a spare key you keep in case you lose the first one.
Mom keeps a secondkey under the flowerpot for emergencies.
OTHER MEANINGS
2. A second password or code used to unlock something extra.
The app asked for a secondkey to confirm the payment.
3. A second important clue or answer in a puzzle.
The riddle had a secondkey hidden in the last line.
4. A second button on a keyboard or device.
Press the secondkey to switch the screen.