slacciare bedeutet auf Englisch

undo [undid, undone, undoing, undoes]▼(to unfasten)
verb
[UK: ʌn.ˈduː] [US: ʌn.ˈduː]Don't undo your bootlaces until you have seen the river. = Non si slacci i lacci degli stivali finché non ha visto il fiume.