When researching online, finding an exact definition was hard.
Does it mean to make oneself hard? Or like to harden yourself?
Could you give me a few examples?
磨练： temper oneself hard
Ben-Hur's years of enduring hardship as a Roman slave strengthened him and increased his endurance.
only through experiences of trial and suffering can the soul be strengthened
Sometimes, you might see 磨炼(smelt) instead of 磨练(exercise/training). There are some disputation on which one is correct. But main idea is that 磨炼 is sort of wrong words, but you may understand it as a synonym.
磨练 / mó liàn /
put oneself through the mill; temper oneself; steel oneself:
go through trails and tribulations;
A side note: You should have a Chinese dictionary handy. I've seen some folks in this site use Pleco.
磨練球技 - to hone one's football skill
磨練刀法 - to hone one's knife skill
磨練身心 - to temper/ steel one's body and mind
一個磨練 - an endurance
一個艱苦的磨練 - a tough endurance
鍛練(to forge) is a term similar to 磨練(to hone)
鍛練身體 (to temper/forge one's body) ;
鍛練技巧 (to temper/forge one's skill set)
磨練技巧 (to hone one's skill)
一個鍛練 - a workout
Difficult word to pin down, depends on what you wish to express.
艰苦可磨练个性。 Hard work builds character.
生活的磨练早已使他愤世嫉俗. Experience had embittered his heart against the world.
可以预料, 那将是非常艰苦的磨练. I expect it to be quite an ordeal.
艰苦的磨练：quite an ordeal