diff --git a/Lib/idlelib/autocomplete_w.py b/Lib/idlelib/autocomplete_w.py
index 7c3138f4040..12113f95e63 100644
--- a/Lib/idlelib/autocomplete_w.py
+++ b/Lib/idlelib/autocomplete_w.py
@@ -246,7 +246,7 @@ class AutoCompleteWindow:
         acw.wm_geometry("+%d+%d" % (new_x, new_y))
 
         if platform.system().startswith('Windows'):
-            # See issue 15786. When on windows platform, Tk will misbehaive
+            # See issue 15786. When on windows platform, Tk will misbehave
             # to call winconfig_event multiple times, we need to prevent this,
             # otherwise mouse button double click will not be able to used.
             acw.unbind(WINCONFIG_SEQUENCE, self.winconfigid)
diff --git a/Lib/idlelib/idle_test/test_query.py b/Lib/idlelib/idle_test/test_query.py
index 1210afe70df..953f24f0a5a 100644
--- a/Lib/idlelib/idle_test/test_query.py
+++ b/Lib/idlelib/idle_test/test_query.py
@@ -162,7 +162,7 @@ class HelpsourceBrowsefileTest(unittest.TestCase):
         # Path is widget entry, either '' or something.
         # Func return is file dialog return, either '' or something.
         # Func return should override widget entry.
-        # We need all 4 combination to test all (most) code paths.
+        # We need all 4 combinations to test all (most) code paths.
         for path, func, result in (
                 ('', lambda a,b,c:'', ''),
                 ('', lambda a,b,c: __file__, __file__),
diff --git a/Lib/idlelib/idle_test/test_search.py b/Lib/idlelib/idle_test/test_search.py
index 80fa93adf51..3ab72951efe 100644
--- a/Lib/idlelib/idle_test/test_search.py
+++ b/Lib/idlelib/idle_test/test_search.py
@@ -1,7 +1,7 @@
 """Test SearchDialog class in idlelib.search.py"""
 
 # Does not currently test the event handler wrappers.
-# A usage test should simulate clicks and check hilighting.
+# A usage test should simulate clicks and check highlighting.
 # Tests need to be coordinated with SearchDialogBase tests
 # to avoid duplication.