sit in on (something)

Другие идиомы:

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