British, American & Australian, British & Australian

if someone is at sea, they are completely confused.

I'm all at sea with this computer manual.

• in full force
• in full swing
• in fun
• in gear
• in general
• in glory
• in good company
• in good conscience
• in good faith
• in good graces
• in good hands
• in good time
• in hand
• in harness
• in heart of hearts
• in heaven's name
• in her infinite wisdom
• in her wisdom
• in high dudgeon
• in high gear
• in his infinite wisdom
• in his wisdom
• in hock
• in hopes of
• in hopes of doing something