Many a job depends entirely on experience

[Autumn]

I saw a sentence in my course book.That is:Many a job depends entirely on experience.

I am wondering if there is such pattern.It seems strange.Use many and a at the same time.Please help me solve this question.

Thank You. :)

Autumn

[Mister Micawber]

.
Yes, it is reasonably common:

After many a summer dies the swan.
There's many a slip twixt the cup and the lip.

"Many is a predeterminer with singular count nouns preceded by the indefinite article'" (Quirk, et al)
.
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Native English teacher at Mister Micawber's

[Conchita]

'Many a' is one of several set phrases that can be used instead of 'many'.

Examples:

Many a soldier felt the urge to desert: quite a large number

I've been there many a time: often

a good many students: quite a large number

[Mister Micawber]

[Conchita]

[Autumn]

Thank you so much Conchita and Mister Micawber.

[mrdmrd]

I really thank you so much..That is a very important sentence for me.''many a job depends....(its singularity)