燕雀因大厦落成有栖身之所而互相庆贺。后多用作祝贺新屋落成之语。
lit. sparrow and swallow's congratulation (idiom); fig. to congratulate sb on completion of a building project; congratulations on your new house!
燕(yàn yān)
雀(què qiāo qiǎo)
相(xiāng xiàng)
贺(hè)