Mixed company
Some suggest that there must always be at least one women on a spaceship. Because men are more mature in mixed company
Hey, David, Don't talk about sex. We are in mixed company
Both men and women talk about the opposite sex when they are not in mixed company
Definition: a group of people in which there are males and females
Smoking gun
People who don't believe Americans landed on the moon in 1969, point to the American flag waving on the moon as the smoking gun
After people could not figure out why the small plane crashed, an eye witness account that the plane looked heavy before take-off was the smoking gun
Fingerprints left on the only knife on the Island mansion were the smoking gun for the murder
Definition: was originally, and is still primarily, a reference to an object or fact that serves as conclusive evidence of a crime or similar act, just short of being caught. its meaning has evolved in uses completely unrelated to criminal activity: for example, scientific evidence that is highly suggestive in favor of a particular hypothesis is sometimes called smoking gun evidence.
Etymlogy: The phrase originated in the Sherlock Holmes story, The Adventure of the Gloria Scott (1893) Its name originally came from the idea of finding a smoking (i.e., very recently fired) gun on the person of a suspect wanted for shooting someone, which in that situation would be nearly unshakable proof of having committed the crime.
Feel out
We need to feel out the landlord before asking to lower the rent
Rick and his family wanted to feel out their new neighborhood before making a commitment to live there
Ross wanted to feel out his boss before asking for a raise
Definition: to find out what someone thinks about someone or something. (This does not involve touching anyone.
Etymology: This term alludes to physical groping.