sit in on (something)

Другие идиомы:

• sit in judgment of (someone)
• sit on the fence
• sit bolt upright
• sit up with (someone)
• sit back
• sit up and take notice
• sit-in
• sit on one's hands
• sit idly by
• sit in for (someone)
• sit around (somewhere)
• sit on its/their hands
• sit through (something)
• sit (something) out
• sit at (someone's) feet