Here are some common idioms about love, along with their meanings and example sentences: 

1. Head over heels (in love) 

Meaning: Deeply and completely in love. 

Example: He’s head over heels in love with her. 

2. Love at first sight 

Meaning: Falling in love the first time you see someone. 

Example: It was love at first sight when they met at the party. 

3. Have a crush on someone 

Meaning: To have romantic feelings for someone (usually a secret or early-stage attraction). 

Example: She has a crush on her coworker. 

4. Pop the question 

Meaning: To ask someone to marry you. 

Example: He popped the question during their vacation in Italy. 

5. Tie the knot 

Meaning: To get married. 

Example: They’re finally tying the knot this summer. 

6. Match made in heaven 

Meaning: A perfect couple. 

Example: Everyone says they’re a match made in heaven. 

7. Wear your heart on your sleeve 

Meaning: To show your emotions openly. 

Example: He wears his heart on his sleeve, especially when it comes to her.

8. Fall for someone 

Meaning: To start loving someone. 

Example: I didn’t mean to fall for him, but I couldn’t help it. 

9. On the rocks 

Meaning: A relationship in trouble or near breakup. 

Example: Their relationship is on the rocks after the argument. 

10.  Break someone’s heart 

Meaning: To cause someone emotional pain, often through rejection or a breakup. 

Example: She broke his heart when she left him.