Affirmative. Originally used over the radio to signify that you heard the other - you guessed it - 'loud and clear', the term now simply means "Yes, I understand you, now kindly leave me alone."
Teacher: "By Lord Iain, I want that damned work in tomorrow or it's your head! Do you hear me?"
Iain: "Loud and clear."
Talking loud and clear
Saying just what I feel
Lying in the grass With the sun on our backs
It doesn't really matter
What we do or what we say
With every little movement
We give ourselves away
Opposite and opposite
Decisions are reversed
Facing one another
With words that couldn't hurt
With every little word
You're getting closer to me
Talking loud and clear
Saying just what we feel today
Talking loud and clear
Saying just what we feel
Lying in the grass We've got time on our hands
Body next to body
With silence all around
We understand each other
But didn't make a sound
Promises and promises
Of vows we shall return
Facing one another
I thought my heart would burn
You turn to move away
But then get closer to me
Talking loud and clear
Saying just what we feel today
When some resigns or retires from a job, they are on "eternity leave". This can also refer to someone who has passed away, especially someone who worked somewhere for a long time, retired/resigned, then passed away later.
Oh I'm sorry, you didn't know that Kelly is on eternity leave? She resigned and moved to Hawaii!
With regrets I would like to inform you that my boss is officially on eternity leave. I will never see or hear them again. Ever.