1. be getting on
Meaning 1 (of people): Be becoming old
Meaning 2 (of time): Be becoming late
2. be off
Meaning 1: to leave a place
Meaning 2 (of food): to be in a bad condition / stale / out of date
Examples
1.
A: How’s your grandfather doing?
B: He’s getting on a bit now so he can’t walk as fast as he used to.
2.
A: Dad, can I play video games for a while?
B: No it’s getting on. It’s nearly time for bed.
3.
A: Where are you going?
B: I’m off to the supermarket. Would you like anything?
4
A: Smell this milk. Do you think it’s OK?
B: …Yuck! No don’t drink it, it’s off.
5.
A: So who’s ready for some karaoke?
B: Not me. It’s getting on so I better be off home.I have to work tomorrow.
6.
A: I think I’m getting on. Can you read the use-by-date on this yoghurt pot? It’s too small for my eyes.
B: It says ‘Use by March 2011’. It’s June 1st today, so I think it must be off.
