«فَكِّ الْخِنَاقْ تَشْرِيبَهْ»

The picture is of a hold clamped around the throat. When that grip slackens, the person caught in it can breathe again, and the saying likens this loosening to a welcome drink, treating the easing of a choking constraint as refreshing in itself.

The weight falls on degree rather than completeness. The hold does not have to be removed entirely for the relief to count; even a modest slackening is presented as enough to let a person catch their breath and recover some ease.

Suited to moments when a tight constraint on someone loosens only partway, to remark that this partial slackening already brings a real measure of ease and should be recognized as such.