There are several prepositions that we can construct using the word ข้าง (khâang), which by itself means "side."
We also use ข้าง (khâang) in several common prepositions that don't contain the word "side" in their English versions.
Examples:
<<…เกี่ยวกับ… (…gìiao gàp…)<<
➤ "I'm going to watch a movie about Thailand."
<<โต๊ะตัวนั้น (dtó dtuua nán)<<
<<ต้อง… (dtâwng…)<<
<<ออกไป (àawk bpai)<<