the best / greatest thing since sliced bread

/ðə bˈɛst ɡɹˈeɪtəst θˈɪŋ sˈɪns slˈaɪst bɹˈɛd/

/ðə bˈɛst ɡɹˈeɪɾəst θˈɪŋ sˈɪns slˈaɪst bɹˈɛd/

a thing or person that one believes to be extremely good, useful, interesting etc.

Examples

1. Jack thinks he’s the best thing since sliced bread.

2. He reckons his new mobile phone is the best thing since sliced bread.

3. He thinks wireless Internet access is the greatest thing since sliced bread.

4. I remember when we thought that flip phones were the best thing since sliced bread.