Those seem to be reasonable conclusions, but what is especially interesting
is the relatively late appearance or re-emergence of _tentor_  if indeed
from _tentir_, considering how few Indonesians now have any useful command
of Dutch. It is still a bit of a puzzle in that respect. After being here
for nearly 30 years I first encountered it only last year. One more
possibility: it could have been a regional term that only spread with the
saturation of the Internet in society. I Googled and found a lot of
advertisements for tentor in the sense of a private teacher or tutor.

Thanks//Ray