A blot on the/one's escutcheon American British noun phrase
A stain to disgrace one's honor and reputation
James scored an own goal at the important match, which was like a blot on his escutcheon.
Be careful with your word! Don't be a blot on the escutcheon before the friends' presence.
Jenifer is a famous singer, the love scandal will be a blot on her escutcheon for years.
To not wonder, worry or be surprised about what is not predicted will happen in life because anything could happen
Sometimes, the secret to stay happy is to expect the unexpected.