Definition
to hand over your luggage to airline personnel at the airport to be loaded onto the aircraft instead of taking it with you on the flight.
在機場托運行李，交付給工作人員
Before heading to the gate, we need to check our luggage in early.
在前往登機口之前，我們需要提前托運行李。
She always opts to check her bags in early at the airport, so she can avoid hassle during boarding.
她總是選擇在機場提前托運行李，這樣可以在登機時避免麻煩。
We need to go to the baggage check-in counter to hand our luggage over to the airline.
我們需要去行李托運櫃檯將行李交給航空公司。