Today's idioms are:

🔘 mend your ways ✏️

☑️ Meaning: If you mend your ways, you improve your behaviour and stop doing things that cause trouble.

✳️ Terry had better mend his ways or Rosie will leave him forever.

✳️ It took him a long time to mend his ways, but these days Jack is a good father and husband.

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🎚️ set your sights on 👁

☑️ Meaning: If you set your sights on something, or set your sights on doing something, it becomes the target of your ambition or the object of your attention.

✳️ Stanley has set his sights on coaching Liverpool, so he'll start getting to know people who have influence in the club.

✳️ Microsoft has set its sights on one of the biggest search engine companies, so I wouldn't be surprised if the company's shares go up.

🎯 Note: This idiom can also be expressed as "has its sights set on", "has her sights set on", "have their sights set on", and so on.
🎯 Origin: Metaphorical, and related to the fact that a person using a gun looks through the gun's sights in order to aim, and will have his sights set on the target before shooting at it.
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🔘 a dark horse 🐴

☑️ a person about whom little is known

✳️ Mary's a bit of a dark horse. Do you think she's got any chance of being elected?

@Zabanunim