Wiktionary
what someone said
phr. (context idiomatic English) (non-gloss definition: Used to indicate agreement, as if one would have wanted to say what a previous speaker has said, without change or qualification)
Usage examples of "what someone said".
Thousands of times during my mother's life when she misinterpreted what someone said, she watched the other person grow impatient or become angry because she seemed so slow.
That's what someone said was growing in the garden, but it made Leonie sneeze, so we took it out.
Hence, in most legal systems for thousands of years, a report of a performative statement has been admissible as evidence, since it is regarded not as a report of what someone said (for it would then be inadmissible as hearsay) but as evidence of an action, of what someone did.