Sniff out phrase
(Usually said of dogs) To use one's sense of smell to detect or locate someone or something.
This dog is trained to sniff out substances such as explosives or illegal drugs.
I have trained my dogs to sniff out missing people.
To discover, unveil, or expose someone or something by investigating them.
Police have sniffed out a plot to abduct the President's son.
After sniffing out John smuggling illegal weapons into the country, Mary was beaten to death.
To encounter or catch someone who is doing something that they are not prepared for and that reveals something embarrassing or shocking about them
To try to discover or understand the true facts about a situation before taking any action
After a long time of not knowing or being misled about something, you finally realize the truth about it
1. To discover that someone has wrong or deceptive actions
2. To realize that someone is no longer at home
The verb "sniff" must be conjugated according to its tense.
The second meaning dates from the first half of 1900s.
Stupid or crazy
He is definitely not the full shilling when wearing a thick coat in this sultry weather.