to  pick  up the  bill  for  something
pick
pɪk
pik
up
ʌp
ap
the
ðə
dhē
<abbr style="text-decoration: underline;" title="bill / check / tab" > bill </abbr>
bɪl
bil
for
fɔ:
faw
something
sʌmθɪng
samthing
[pick] up the (bill|check|tab)

Definition & Meaning of "pick up the bill for something "in English

to pick up the bill for something
01

to pay the expense of something, usually instead of someone else 

to [pick] up the (bill|check|tab) for {sth} definition and meaning
Idiom

What is the origin of the idiom "pick up the bill" and when to use it?

The origin of the phrase "pick up the bill" is not precisely known, but it likely developed from the idea of someone physically picking up a restaurant bill or invoice after a meal or transaction. This idiom is used to describe the act of paying for something, especially the expenses or costs incurred by oneself or others.

Examples
I'll pick up the bill for dinner tonight. 
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