首付的英文：
down payment

参考例句：

We are saving for a down payment on a house.
我们正攒钱支付买房的首付金。

down是什么意思：
prep. 在…下，沿着
v. 下降，打倒
n. 潦倒；羽绒；丘陵

Down with hegemonism!
打倒霸权主义！

The sun is down.
太阳下山了。

Close down autos and you close down steel and rubber.
关掉了汽车工业你也就关掉了钢铁工业和橡胶工业。

nail down; nail in;hold by
钉住;使人遵守诺言

break down resistance
粉碎反抗，制服反抗

payment是什么意思：
n. 付款，支付，收款；款额，款项；报答，报偿

The players struck their boss for the payment.
球员们为要求老板加薪而罢赛。

They have guaranteed prompt payment.
他们保证及时付款。

The bank call for a moratorium on payment .
银行要求延缓款项偿付期。

This is called the down payment.
通常称为现付款。

The factory defaulted on the payment for the materials.
工厂买原料的钱迟迟不还。