knew one's arse from one's elbow

Questions

What does knew one's arse from one's elbow mean?

simple past of know one's arse from one's elbow

How to pronounce knew one's arse from one's elbow

1. Open the pronunciation page — Open the Speakur entry for “knew one's arse from one's elbow”.
2. Read the phonetic spelling — Read the IPA spelling () so you know which sounds to aim for.
3. Play the audio — Click Play to hear reference audio for “knew one's arse from one's elbow”.
4. Repeat and practice — Say “knew one's arse from one's elbow” aloud, matching stress and vowels until it feels natural.