The antonyms for the word "out-pouring" are containment, retention, and suppression. These words oppose the idea of a sudden and excessive release of emotions, thoughts, or support. Containment suggests an ability to control or limit the flow of something, while retention denotes the ability to hold back or keep private one's feelings or thoughts. Suppression means to repress, silence or forbid the expression of emotions or ideas. All of these antonyms are applicable in situations where one needs to exercise restraint, caution or maintain social decorum. In contrast, "outpouring" implies a moment of vulnerability, spontaneity or empathy.