Usage patterns
〈物〉に曲げを加えるto apply a bend to something
They bent the pipe to route the plumbing through.
曲げに強いresistant to bending
This material is resistant to bending and doesn't break easily.
曲げが生じるfor a bend to occur (in a material)
If too much load is applied, the steel frame develops a bend.
Expressions
へそを曲げるsulk; get cranky; get cross; become perverse 節を曲げないstick to one's principles; not budge an inch つむじを曲げるbe contrary; be perverse; get sulky