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I stumbled upon a sentence where I don't get the grammar:

> (括れは) 柔{やわ}らかなままに弾{はず}んだ力{ちから}をたわめていて

the topic being the waist of a woman.

What I don't understand shouldn't it rather be で instead of を (because the
waist is bent with a springyness or elasticity)?

Or is it a case where で and を can be used equivalently similar like in this
post here: [Making sense of transitive usage of 行く and 来る - 「を行く」 and
「を来る」](https://japanese.stackexchange.com/questions/3243/making-sense-of-
transitive-usage-
of-%e8%a1%8c%e3%81%8f-and-%e6%9d%a5%e3%82%8b-%e3%82%92%e8%a1%8c%e3%81%8f-and-%e3%82%92%e6%9d%a5%e3%82%8b?rq=1)
?

In my opinion it would be the waist that should be an object to たわめる.

BTW: is たわめる the potential form of たわむ? because my dictionary has two
different entries for たわめる - one potential form of "to bend/たわむ" and the other
"to bend (a piece of wood)" which is not potential. Is there any real
difference?

Thanks a lot!
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grammar particle-を
ちから, たわめる and を-Particle
> is たわめる the potential form of たわむ?

No, たわむ doesn't have the potential form because it's a non-volitional
intransitive verb, besides, the subject for たわむ is virtually limited to
inanimate objects, which can't be the subject for potential verbs, like your
example.

たわめる is the transitive version of たわむ. In this case, 捩じれ is the subject to
bend something and 弾んだ力 is the object to be bended.
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Grammatically speaking, たわめる is a simple transitive verb, くびれ is its subject,
and 弾んだ力 is its object. (を before an intransitive verb is also a kind of
location marker like English "across" or "through", but that has nothing to do
with this sentence.)

Dictionaries say たわめる is a transitive verb meaning "to bend (something)",
although "to bend a force" makes little sense. Actually, たわめる is a more
nuanced verb. It's used with an elastic sheet- or stick-like object (e.g.,
bow, bamboo, rubber mat), and implies the existence of a restoring force.
Bending a steel pipe using a burner is パイプを曲げる but not パイプをたわめる because the
deformation is irreversible. So, although 力をたわめる is perhaps not a standard
combination, I think it means "to _hold/store_ a (spring-like, elastic) force"
here. 柔らかなままに弾んだ力をたわめていて is basically describing how her waist is "soft yet
_bouncy_ ".
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answer