diff --git a/scripts/gen-bilingual.fish b/scripts/gen-bilingual.fish
new file mode 100755
index 0000000..5c5db82
--- /dev/null
+++ b/scripts/gen-bilingual.fish
@@ -0,0 +1,57 @@
+#!/usr/bin/env fish
+# Generate bilingual.dj from source.dj + target.dj in a directory
+# Usage: gen-bilingual <dir-containing-source.dj-and-target.dj>
+
+set dir (realpath $argv[1])
+set src "$dir/source.dj"
+set tgt "$dir/target.dj"
+set out "$dir/bilingual.dj"
+
+if not test -f $src; or not test -f $tgt
+    echo "Missing source.dj or target.dj in $dir" >&2
+    exit 1
+end
+
+python3 -c "
+import sys
+src_path, tgt_path, out_path = sys.argv[1:]
+
+with open(src_path) as f:
+    src_lines = f.read().splitlines()
+with open(tgt_path) as f:
+    tgt_lines = f.read().splitlines()
+
+src_toc = src_lines[4:32]
+tgt_toc = tgt_lines[4:32]
+src_body = src_lines[33:]
+tgt_body = tgt_lines[33:]
+
+out = []
+
+out.append(src_lines[0])
+out.append(tgt_lines[0])
+out.append('')
+
+out.append(src_lines[2])
+out.append(tgt_lines[2])
+out.append('')
+
+for line in src_toc:
+    out.append(line)
+out.append('')
+for line in tgt_toc:
+    out.append(line)
+out.append('')
+
+for s, t in zip(src_body, tgt_body):
+    if s == '' and t == '':
+        continue
+    out.append(s)
+    out.append(t)
+    out.append('')
+
+with open(out_path, 'w') as f:
+    f.write(chr(10).join(out))
+" $src $tgt $out
+
+echo $out