Curve ball and Red herring

Curve ball noun - A pitch of a baseball that is thrown with spin so that its path curves as it approaches the batter.

Red herring and curve ball are semantically related In some cases you can replace phrase "Red herring" with "Curve ball", this phrases are similar.

Red herring noun - Any diversion intended to distract attention from the main issue.

Curve ball and red herring are semantically related in misleading clue topic. You can use "Curve ball" instead a noun phrase "Red herring".