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ABC

1 ABC /ˌeɪˌbiˈsiː/ noun
plural ABCs or ABC's
1 ABC
/ˌeɪˌbiˈsiː/
noun
plural ABCs or ABC's
Britannica Dictionary definition of ABC
: the letters of the English alphabet
[plural]
[singular]
: the most basic or important information about a subject
[plural]
[singular]

(as) easy as ABC

see 1easy
2 ABC abbreviation
2 ABC
abbreviation
Britannica Dictionary definition of ABC
American Broadcasting Corporation
◊ ABC is one of the major television networks in the U.S.
Australian Broadcasting Corporation