* To hum a tune: This is the most common meaning of "hum" in Thai. For example, you might say "ฉันกำลังฮัมเพลง" (chan gam hum plaeng) which translates to "I am humming a song."
* To buzz (like an insect): This meaning is less common but still used. For example, you might say "ยุงฮัมหู" (yung hum hoo) which translates to "A mosquito is buzzing in my ear."
* To murmur (like a voice): This meaning is also less common and used in more formal contexts. For example, you might say "เสียงฮัมเบาๆ" (siang hum bao bao) which translates to "A soft murmur."
The meaning of "hum" in Thai will be clear from the context in which it is used.