as mad as a hatter
Meaning: it refers to someone being completely crazy
Example: The way he dressed for the event, he must be as mad as a hatter. Read on
at the drop of a hat
Meaning: at the slightest signal
Example: We now have a situation where laws are bent at the drop of a hat. Read on
call bluff
Meaning: to challenge to prove one's claim, when they are likely attempting to deceive
Example: When the employee threatened to quit if he was not given a pay rise, the boss called his bluff. Read on
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