diff --git a/doc/pages/keys.asciidoc b/doc/pages/keys.asciidoc
index 76512929..8de96aa7 100644
--- a/doc/pages/keys.asciidoc
+++ b/doc/pages/keys.asciidoc
@@ -707,3 +707,7 @@ The following keys are recognized by this mode to help edition.
 
 *<c-o>*::
     disable auto completion for this prompt
+
+*<a-!>*::
+    expand the typed expansions in currently entered text
+    (See <<expansions#typed-expansions,`:doc expansions typed-expansions`>>)
diff --git a/src/input_handler.cc b/src/input_handler.cc
index 3b80d4ee..f95fff6c 100644
--- a/src/input_handler.cc
+++ b/src/input_handler.cc
@@ -4,6 +4,7 @@
 
 #include "buffer_manager.hh"
 #include "buffer_utils.hh"
+#include "command_manager.hh"
 #include "client.hh"
 #include "event_manager.hh"
 #include "face_registry.hh"
@@ -875,6 +876,18 @@ public:
             if (context().has_client())
                 context().client().menu_hide();
         }
+        else if (key == alt('!'))
+        {
+            try
+            {
+                m_line_editor.reset(expand(m_line_editor.line(), context()), m_empty_text);
+            }
+            catch (std::runtime_error& error)
+            {
+                context().print_status({error.what(), get_face("Error")});
+                return;
+            }
+        }
         else
         {
             m_line_editor.handle_key(key);