"In irons" is a sailing term describing a sailboat stopped and stuck pointing directly into the wind, often known as the "no-go zone". The sails luff (flap) uncontrollably, and the rudder becomes ineffective, making steering impossible, usually caused by failing to complete a tacking maneuver.

Key Aspects of Being "In Irons":
Position: The bow is facing directly into the wind (0-15 degrees), preventing the sails from filling with air.

Behavior: The boat loses all forward momentum and stops moving forward.

Sails: Both the jib and main sails will "luff" or flap uncontrollably because they cannot catch the wind.

Control: The rudder cannot turn the boat because there is no water flowing past it.

The phrase is derived from nautical jargon referring to being trapped, as if in iron shackles.