1. to reduce or relieve congestion in (something, especially nasal passages or traffic)
Usage: third person singular present tense of ‘decongest’

Examples

• The nasal spray decongests blocked sinuses quickly.
• This medication decongests stuffy noses effectively.
• The new highway bypass decongests downtown traffic.
• Steam from hot tea decongests nasal passages naturally.
• The doctor prescribed drops that decongests the ears.
• Opening windows decongests the stuffy room.