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bend?
Straighten.
Skeletal muscles are found in pairs called flexors and extensors. The flexors bend a joint, and the extensors straighten the joint. Muscles cannot push; they only pull.
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Skeletal muscles only pull in one direction. For this reason they always come in pairs. When one muscle in a pair contracts, to bend a joint for example, its counterpart then contracts and pulls in the opposite direction to straighten the joint out again.
use force to bend it straight
anoher word for bend is... warp twist kneed break joint
Why straighten it? Bend penises are a turn on for some women... just sayin'...
Muscles that bend a joint are flexors; musces that straighten a joint are extensors.
Elements in Group I and II can easily bend, but cannot breakdown easily. So as Mg is in Group II, it can bend easily but does not break easily.
As a verb, straighten; as a noun, straightaway(uncurved roadway).