说 means to speak; to say; to explain; to scold; to tell off;
a theory (usually in compounds such as heliocentric theory)
Some Examples
说服 shuōfú to persuade; to convince; to talk somebody over
说法 shuōfa way of speaking; wording; formulation; one's version (of events); statement; theory; hypothesis; interpretation
说谎 shuōhuǎng to lie; to tell an untruth tīngxiě dictate; dictation miáoxiě to describe; to depict; to portray; description chāoxiě to copy; to transcribe xiěxìn to write a letter xiězì to write characters xiězuò to write; to compose; writing; written works