Question 1

What does "vent your spleen" mean?

Accepted Answer

To release anger or frustration, often verbally and at some length.

Question 2

How do you use "vent your spleen" in a sentence?

Accepted Answer

She vented her spleen in a long and furious email to the management.

Question 3

Is "vent your spleen" formal or informal?

Accepted Answer

"vent your spleen" is register-neutral — appropriate in both casual and formal contexts. From the ancient belief that the spleen was the seat of anger; used when someone lets out bottled-up rage.