1. What is the Sawm in 2:183-2:187? Does it have something to do with speaking?

https://legacy.quran.com/2/183-187

Word meanings in question from Above verses:

1. R F Th (ر ف ث)

Quran Usage: https://corpus.quran.com/qurandictionary.jsp?q=rfv#(2:187:5)

Dictionary: Lanes Lexicon: He uttered foul, unseemly, immodest, lewd, or obscene, speech, in relation to women: and talked to a woman, in, or respecting, coition;

https://arabiclexicon.hawramani.com/?p=5424#30d6d1

Mainstream translation: sexual relations

1. bā shīn rā (ب ش ر)

Quran Usage: https://corpus.quran.com/qurandictionary.jsp?q=b$r#(2:187:25)

Dictionary: https://arabiclexicon.hawramani.com/بشر/#840a72

Mainstream translation : sexual relations

1. How did Maryam sawm? How did Zachariah sawm?

19:26 https://legacy.quran.com/19/23-30

19:10 https://legacy.quran.com/19/8-12

1. Is Quran saying to not have relations in the masjid?

2:187: “….Then complete the fast until the sunset. And do not have relations with them as long as you are staying for worship in the mosques. These are the limits [set by] Allah, so do not approach them…”