ちから, たわめる and を-Particle


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!




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_ ".




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_ ".

