掏腰包的英文：
dig down
dip into one's pocket

参考例句：

They take no fee, indeed they dip into their own pockets.
他们不收费，甚至还要自己掏腰包。

People would not dig down for such a performance.
人们不愿意为这样的演出掏腰包。

The customers will not dig down for such entertainment
顾客不会为这种娱乐节目掏腰包。

They had to dig down to pay for gas and meals.
他们得掏腰包自付汽油费和饭费。

No use asking the old man. He'd never cough up
不用问那老子要，他是不会掏腰包的。

The group was surprised to see Patrick dip into his pocket and offer to buy round of drinks.
看到帕特里克掏腰包表示愿意买酒给大家喝，那群人都感到大为吃惊。

dig是什么意思：
v. 掘；凿；挖；挖掘；掘得；发掘
n. 刺，戳，碰；挖苦

They are digging at physics.
他们在钻研物理学。

What are they digging for?
他们正在探究什么?

To dig or hollow out.
挖洞，挖空

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。

dip是什么意思：
v. 浸，泡，蘸；下降；掏；把…伸入；把（汽车前灯的）远光调为近光；洗药浴
n. 浸渍；下降；药浴液

Their father was helping to dip the sheep.
他们的父亲在帮忙给羊群洗药浴。

He dipped a finger in it.
他把一个手指伸进里面蘸了一下。

The seagull dipped in the ocean.
这只海鸥在大洋上沾一沾水。