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1. verb To physically climb onto something. Someone will have to go on the roof to clean those gutters.
2. verb To continue or speak for a tedious or exasperating length of time. In this usage, "go on" is typically followed by "and on." That film was so stupid, and it just went on and on—I thought it would never be over! My date kept going on about his charity work, never even asking what I do for a living.
3. verb To start some activity or task. We went on a long walk around the neighborhood.
4. verb To stretch out from a particular place. The river seemed to go on for miles!
5. verb To proceed or persist. Well, the party must go on, whether we have caterers or not! Can you believe that wisecracking kid went on to become a doctor?
6. verb To use something, often a computer. Do you mind if I go on your computer and check my email?
7. verb To use as evidence or as an explanation for something. You won't be arrested, not when the opposing council has nothing to go on.
8. verb To appear before an audience. You need to go on TV so that everyone can hear your side of the story.
9. verb To be approaching some age, either literally or figuratively. My daughter is going on 16 and is very excited to finally be able to drive. I feel like I'm 30 going on 80 with all these aches and pains!
10. verb To start working. A: "Has the TV gone on yet?" B: "No, there must be a blown fuse."
11. verb To begin taking or using a medication. My doctor wants me to go on blood-thinners, but the side-effects worry me.
12. verb To start broadcasting. I can't believe it's been 30 years since that show first went on.
13. verb To take some impassioned action, usually one that impacts oneself or others negatively. The man who went on a violent rampage has not been found by police yet. I went on a binge this weekend and felt sick for days afterward.
14. expression An invitation for someone to do something. Please go on—how wonderful was the gala? Go on, have a seat and tell me about yourself.
15. expression That's crazy or absurd! Oh, go on! You didn't really chase a bear out of your yard, did you?
See also: on
happening; occurring. What is going on here? Something is going on in the center of town. Can you hear the sirens?
Also, going on for. Approaching, especially an age or time. For example, She's twelve, going on thirteen, or It's going on for midnight. The first term dates from the late 1500s, the variant from the mid-1800s. Also see go on.
— going on —used to suggest that someone's behaviour or attitudes are those of someone older or younger than their actual age. humorous
1994 Janice Galloway Foreign Parts Cassie, carrying this bloody windsurfing board through customs. Thirty-one going on fifteen.
Approaching: The child is six, going on seven years of age.