hurtbutton
nounUK /ˈhɜːtˌbʌtən/
US /ˈhɝːtˌbʌtən/
A hurtbutton is a button you press to show that you are hurt.
When she fell off the swing, she pressed the hurtbutton to call for help.
OTHER MEANINGS
2. A button on a toy or game that makes a character say 'ouch'.
He kept tapping the hurtbutton on his robot to hear it squeak.
3. A spot on a screen that reports pain in a health app.
Tap the hurtbutton in the app to tell the doctor where it hurts.
4. A sensitive topic that upsets someone when mentioned.
Money is a hurtbutton for him, so please don't bring it up.