From Longman Dictionary of Contemporary Englishspleenspleen /spliːn/ noun 1 [countable]HBH an organ near your stomach that controls the quality of your blood2 [uncountable] formalANGRY anger, especially unreasonable or unfair anger Obviously you’re annoyed, but that doesn’t give you the right to vent your spleen on me (=get angry with me).
Examples from the Corpus
spleen• Bernie Nichols of the Chicago Blackhawks recently returned from a spleen injury.• He was taken to Leeds General Infirmary with broken ribs and a damaged spleen.• An example of this is the young man with the enlarged spleen whose story was told in Chapter 1.• Pray heaven Araminta was not going to vent her spleen again!• We pour another glass and vent our spleen on drug barons and dope fiends.• These pits represent cellular debris normal removed by the spleen.• There's evidence of splenomegaly, enlargement of the spleen, and of the liver.vent ... spleen• We pour another glass and vent our spleen on drug barons and dope fiends.• Nell McCafferty, Bernadette Devlin and other notables vented their feminist spleen at an appreciative audience.• Pray heaven Araminta was not going to vent her spleen again!• Or perhaps it would simply be an opportunity to vent their spleen.• I feel much better now I've vented my spleen on this subject.Origin spleen (1200-1300) Old French esplen, from Latin splen, from Greek 