diff --git a/app/jobs/scheduled/check_translation_overrides.rb b/app/jobs/scheduled/check_translation_overrides.rb
index 11d7d4cd97a..5efed5592dc 100644
--- a/app/jobs/scheduled/check_translation_overrides.rb
+++ b/app/jobs/scheduled/check_translation_overrides.rb
@@ -5,17 +5,21 @@ module Jobs
     every 1.day
 
     def execute(args)
+      deprecated_ids = []
       invalid_ids = []
       outdated_ids = []
 
       TranslationOverride.find_each do |override|
-        if override.invalid_interpolation_keys.present?
+        if override.original_translation_deleted?
+          deprecated_ids << override.id
+        elsif override.invalid_interpolation_keys.present?
           invalid_ids << override.id
         elsif override.original_translation_updated?
           outdated_ids << override.id
         end
       end
 
+      TranslationOverride.where(id: deprecated_ids).update_all(status: "deprecated")
       TranslationOverride.where(id: outdated_ids).update_all(status: "outdated")
       TranslationOverride.where(id: invalid_ids).update_all(status: "invalid_interpolation_keys")
     end
diff --git a/app/models/translation_override.rb b/app/models/translation_override.rb
index 0cad3951a8b..0ac4cbeb090 100644
--- a/app/models/translation_override.rb
+++ b/app/models/translation_override.rb
@@ -45,7 +45,7 @@ class TranslationOverride < ActiveRecord::Base
 
   validate :check_interpolation_keys
 
-  enum :status, %i[up_to_date outdated invalid_interpolation_keys]
+  enum :status, %i[up_to_date outdated invalid_interpolation_keys deprecated]
 
   def self.upsert!(locale, key, value)
     params = { locale: locale, translation_key: key }
@@ -129,6 +129,12 @@ class TranslationOverride < ActiveRecord::Base
   private_class_method :i18n_changed
   private_class_method :expire_cache
 
+  def original_translation_deleted?
+    !I18n.overrides_disabled { I18n.t!(transformed_key, locale: :en) }.is_a?(String)
+  rescue I18n::MissingTranslationData
+    true
+  end
+
   def original_translation_updated?
     return false if original_translation.blank?
 
@@ -158,6 +164,10 @@ class TranslationOverride < ActiveRecord::Base
 
   private
 
+  def transformed_key
+    @transformed_key ||= self.class.transform_pluralized_key(translation_key)
+  end
+
   def check_interpolation_keys
     invalid_keys = invalid_interpolation_keys
 
diff --git a/spec/jobs/check_translation_overrides_spec.rb b/spec/jobs/check_translation_overrides_spec.rb
index 2982af7acb1..2bd0e63dd44 100644
--- a/spec/jobs/check_translation_overrides_spec.rb
+++ b/spec/jobs/check_translation_overrides_spec.rb
@@ -2,11 +2,18 @@
 
 RSpec.describe Jobs::CheckTranslationOverrides do
   fab!(:up_to_date_translation) { Fabricate(:translation_override, translation_key: "title") }
+  fab!(:deprecated_translation) { Fabricate(:translation_override, translation_key: "foo.bar") }
   fab!(:outdated_translation) do
     Fabricate(:translation_override, translation_key: "posts", original_translation: "outdated")
   end
   fab!(:invalid_translation) { Fabricate(:translation_override, translation_key: "topics") }
 
+  it "marks translations with keys which no longer exist in the locale file" do
+    expect { described_class.new.execute({}) }.to change {
+      deprecated_translation.reload.status
+    }.from("up_to_date").to("deprecated")
+  end
+
   it "marks translations with invalid interpolation keys" do
     invalid_translation.update_attribute("value", "Invalid %{foo}")
 
diff --git a/spec/models/translation_override_spec.rb b/spec/models/translation_override_spec.rb
index e690eb04fc6..54e0caceafc 100644
--- a/spec/models/translation_override_spec.rb
+++ b/spec/models/translation_override_spec.rb
@@ -284,6 +284,28 @@ RSpec.describe TranslationOverride do
     end
   end
 
+  describe "#original_translation_deleted?" do
+    context "when the original translation still exists" do
+      fab!(:translation) { Fabricate(:translation_override, translation_key: "title") }
+
+      it { expect(translation.original_translation_deleted?).to eq(false) }
+    end
+
+    context "when the original translation has been turned into a nested key" do
+      fab!(:translation) { Fabricate(:translation_override, translation_key: "title") }
+
+      before { translation.update_attribute("translation_key", "dates") }
+
+      it { expect(translation.original_translation_deleted?).to eq(true) }
+    end
+
+    context "when the original translation no longer exists" do
+      fab!(:translation) { Fabricate(:translation_override, translation_key: "foo.bar") }
+
+      it { expect(translation.original_translation_deleted?).to eq(true) }
+    end
+  end
+
   describe "#original_translation_updated?" do
     context "when the translation is up to date" do
       fab!(:translation) { Fabricate(:translation_override, translation_key: "title") }