sit in on (something)

Другие идиомы:

• sit through (something)
• sit in for (someone)
• sit in judgment of (someone)
• sit bolt upright
• sit at (someone's) feet
• sit on (something)
• sit right
• sit (something) out
• sit tight
• sit idly by
• sit back and let (something) happen
• sit-in
• sit around (somewhere)
• sit on the fence
• sit up and take notice