ayon-on intrans. 1rumbling sound of very distant thunder or explosion. Mun-aayon-on di kidul handi hilong. The distant thunder could be heard rumbling last night. muN‑/nuN‑. (sem. domains: 220.127.116.11 - Types of sounds.) 2to make rumbling noise as of thunder. Mun-aayon-on di luta te hay kidul. There’s a rumbling noise on the earth because of the thunder. general: One speaker suggested that this refers to a kind of silent thunder that seems to affect the earth during the rainy season, July and August. muN‑/nuN‑.