Anneal rhymes like Peel: which means to remove outer covering..now imagine a cricket ball. If you peel off the outer covering you are left with a cork which is very hard...So, appeal means to harden things.
AnEel is a fish which give out electricity, so it increases its toughness,which can also be increased by heating or cooling
an + kneel is very hard,hold our full body
ANNEAL ===> toughen (steel or glass) by a process of gradually heating and cooling; "temper glass"[VERB]
anneal sounds like heal so when someone heals his bitterness reduces and toughness increases. as simple as that.
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