red flag

The phrase "red flag" refers to a warning sign or indicator of a problem, danger, or potential issue in a given situation. It implies that something is problematic or suspicious and requires attention or further investigation. Red flags can be observed in various contexts, such as personal relationships, business dealings, or any situation where caution is advised.

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the great unwashed
icing on the cake
the female of the species is more deadly then the male
a bolt from the blue
the devil makes work for idle hands to do
red flag
cross your fingers
to each his own
a country mile
claim to fame
fobbed off