to become downcast or lose one's nerve; to shrink back or cower (emotionally withdrawn or timid)
子どもは叱られていじけて部屋にこもってしまった。
The child sulked after being scolded and shut himself in his room.
彼は注意されるとすぐにいじけてしまうタイプだ。
He's the type who immediately gets sulky when criticized.
to become perversely contrary or sullen; to take a petulant, sulky attitude (like 'to be contrary')
頼んでも断られると、彼はすぐにいじけてしまう。
If you ask him and he gets turned down, he quickly becomes sulky.
彼女は思い通りにならないといじけることがある。
She sometimes sulks when things don't go her way.
to be cramped or constrained (used sometimes in a figurative sense)
古いバスは座席が狭くていじける感じがする。
The old bus's seats are so tight it feels cramped.