Is it an idiom: 'repeat business'?

[Julia]

Business English Lesson, Advanced Level

ESL/EFL Test #134 "Marketing Strategies", question 10

......... business is gained by the company that gives the customer what s/he wants.

(a) Reform
(b) Regard
(c) Repeat
(d) Replacement

Business English Lesson, Advanced Level

ESL/EFL Test #134 "Marketing Strategies", answer 10

Repeat business is gained by the company that gives the customer what s/he wants.

Correct answer: (c) Repeat

Your answer was: incorrect
Replacement business is gained by the company that gives the customer what s/he wants.
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Does the phrase "repeat business" have any specific meaning?
Thank you

Julia

[Mister Micawber]

.
'Repeat' is used as an adjective here. 'Repeat business' could more formally grammatically be phrased as 'repeated business'-- it is the same customer making purchases again and again.
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Canadian-American native speaker
who teaches English for a living at Mister Micawber's
ESL cafe: Interview with Mister Micawber