diff --git a/Source/Modules/ControllerModules/ctlInputMethod_Menu.swift b/Source/Modules/ControllerModules/ctlInputMethod_Menu.swift
index e12562b7..d1bfd7cf 100644
--- a/Source/Modules/ControllerModules/ctlInputMethod_Menu.swift
+++ b/Source/Modules/ControllerModules/ctlInputMethod_Menu.swift
@@ -139,6 +139,11 @@ extension ctlInputMethod {
       )
     }
 
+    menu.addItem(
+      withTitle: NSLocalizedString("Optimize Memorized Phrases", comment: ""),
+      action: #selector(removeUnigramsFromUOM(_:)), keyEquivalent: ""
+    )
+
     menu.addItem(NSMenuItem.separator())  // ---------------------
 
     if optionKeyPressed {
@@ -350,6 +355,13 @@ extension ctlInputMethod {
     IME.initLangModels(userOnly: true)
   }
 
+  @objc func removeUnigramsFromUOM(_: Any?) {
+    mgrLangModel.removeUnigramsFromUserOverrideModel(IME.getInputMode())
+    if NSEvent.modifierFlags.contains(.option) {
+      mgrLangModel.removeUnigramsFromUserOverrideModel(IME.getInputMode(isReversed: true))
+    }
+  }
+
   @objc func showAbout(_: Any?) {
     (NSApp.delegate as? AppDelegate)?.showAbout()
     NSApp.activate(ignoringOtherApps: true)
diff --git a/Source/Resources/Base.lproj/Localizable.strings b/Source/Resources/Base.lproj/Localizable.strings
index 02bb0993..a3575430 100644
--- a/Source/Resources/Base.lproj/Localizable.strings
+++ b/Source/Resources/Base.lproj/Localizable.strings
@@ -62,6 +62,7 @@
 "Loading CHS Core Dict..." = "Loading CHS Core Dict...";
 "Loading CHT Core Dict..." = "Loading CHT Core Dict...";
 "Core Dict loading complete." = "Core Dict loading complete.";
+"Optimize Memorized Phrases" = "Optimize Memorized Phrases";
 
 // The followings are the category names used in the Symbol menu.
 "catCommonSymbols" = "CommonSymbols";
diff --git a/Source/Resources/en.lproj/Localizable.strings b/Source/Resources/en.lproj/Localizable.strings
index 02bb0993..a3575430 100644
--- a/Source/Resources/en.lproj/Localizable.strings
+++ b/Source/Resources/en.lproj/Localizable.strings
@@ -62,6 +62,7 @@
 "Loading CHS Core Dict..." = "Loading CHS Core Dict...";
 "Loading CHT Core Dict..." = "Loading CHT Core Dict...";
 "Core Dict loading complete." = "Core Dict loading complete.";
+"Optimize Memorized Phrases" = "Optimize Memorized Phrases";
 
 // The followings are the category names used in the Symbol menu.
 "catCommonSymbols" = "CommonSymbols";
diff --git a/Source/Resources/ja.lproj/Localizable.strings b/Source/Resources/ja.lproj/Localizable.strings
index 3f204d09..e059c5d0 100644
--- a/Source/Resources/ja.lproj/Localizable.strings
+++ b/Source/Resources/ja.lproj/Localizable.strings
@@ -62,6 +62,7 @@
 "Loading CHS Core Dict..." = "簡体中国語核心辞書読込中…";
 "Loading CHT Core Dict..." = "繁体中国語核心辞書読込中…";
 "Core Dict loading complete." = "核心辞書読込完了";
+"Optimize Memorized Phrases" = "臨時記憶資料を整う";
 
 // The followings are the category names used in the Symbol menu.
 "catCommonSymbols" = "常用";
diff --git a/Source/Resources/zh-Hans.lproj/Localizable.strings b/Source/Resources/zh-Hans.lproj/Localizable.strings
index 125d7d85..c26119fe 100644
--- a/Source/Resources/zh-Hans.lproj/Localizable.strings
+++ b/Source/Resources/zh-Hans.lproj/Localizable.strings
@@ -62,6 +62,7 @@
 "Loading CHS Core Dict..." = "载入简体中文核心辞典…";
 "Loading CHT Core Dict..." = "载入繁体中文核心辞典…";
 "Core Dict loading complete." = "核心辞典载入完毕";
+"Optimize Memorized Phrases" = "精简临时记忆语汇资料";
 
 // The followings are the category names used in the Symbol menu.
 "catCommonSymbols" = "常用";
diff --git a/Source/Resources/zh-Hant.lproj/Localizable.strings b/Source/Resources/zh-Hant.lproj/Localizable.strings
index c15a77f3..f7bd537a 100644
--- a/Source/Resources/zh-Hant.lproj/Localizable.strings
+++ b/Source/Resources/zh-Hant.lproj/Localizable.strings
@@ -62,6 +62,7 @@
 "Loading CHS Core Dict..." = "載入簡體中文核心辭典…";
 "Loading CHT Core Dict..." = "載入繁體中文核心辭典…";
 "Core Dict loading complete." = "核心辭典載入完畢";
+"Optimize Memorized Phrases" = "精簡臨時記憶語彙資料";
 
 // The followings are the category names used in the Symbol menu.
 "catCommonSymbols" = "常用";