When someone says, “Look who’s talking“, they’re pointing out that the person making a criticism or an accusation has the same faults as the person they’re criticising. It’s like saying, “You’re just the same” or “You do the same thing.”
Here are two examples in sentences:
Example 1:
When her brother complained about her being on the phone too much, Sarah retorted, “Look who’s talking! You’re always playing video games.”
Example 2:
Mike told his friend, who was complaining about him being late, “Look who’s talking. You were late three times last week.”
Now, let’s see two examples in a conversation:
Example 3:
Emma: Hi, Tom! You’re always eating junk food.
Tom: Look who’s talking, Emma. I saw you eating chips yesterday.
Example 4:
Lucy: Hey, John! You spend too much time watching TV.
John: Look who’s talking, Lucy. You’re always on your phone.
So, when someone says “Look who’s talking“, they’re pointing out that the person making the criticism is guilty of the same thing. It’s a phrase often used to counter a criticism or comment by highlighting the critic’s own flaws or inconsistencies.