This is the 15154th most frequent Polish word.
salwować
To save or rescue.
Here, 'salwować' is used reflexively ('salwować się'), meaning 'to save oneself', commonly by escaping danger.
Żołnierze musieli salwować się ucieczką przed nadchodzącym wrogiem.
The soldiers had to save themselves by fleeing from the approaching enemy.
In this sentence, 'salwę' (a form related to 'salwować') refers to a ceremonial or honorary act involving gunfire, metaphorically linked to the idea of 'saving' or 'honoring' dignity or tradition.
W czasie balu wystrzelono salwę honorową ku czci królowej.
During the ball, an honorary salvo was fired in honor of the queen.
Here, 'salwować' is used figuratively, meaning 'to save or recover', applied to one's reputation or position.