My Cebuana wife says sinso is a chainsaw although she is not aware of the spelling. Neither this dictionary nor Google Translate knows it, though.
We can see the phonology from chainsaw to sinsu:
Let's get their IPA forms first (for Chainsaw, I'll be using the US IPA):
Chainsaw -> [ˈt͡ʃeɪnˌsɔ] Sinsu -> [ˈsiːnˌsʊ]
Vowel Changes:
Consonant Changes:
Applying what we got:
And thus, sinsu comes from chainsaw.
It's probably the nativized form of "chainsaw"
We can see the phonology from chainsaw to sinsu:
Let's get their IPA forms first (for Chainsaw, I'll be using the US IPA):
Chainsaw -> [ˈt͡ʃeɪnˌsɔ]
Sinsu -> [ˈsiːnˌsʊ]
Vowel Changes:
Consonant Changes:
Applying what we got:
And thus, sinsu comes from chainsaw.