diff --git a/service/jargon/defaults.yaml b/service/jargon/defaults.yaml
index 12fb76c14..761fc8473 100644
--- a/service/jargon/defaults.yaml
+++ b/service/jargon/defaults.yaml
@@ -12,6 +12,10 @@ sml: Small
 # mic: Micro # (ineffective)
 xl: X-Large
 
+# sizes
+large: heavy
+heavy: large
+
 # language fixes (american/british differences)
 armour: armor
 neutraliser: neutralizer