Also, get upon. Climb on, mount. For example, They say one should get back on a horse as soon as one's fallen off. [Early 1600s]
See get along, def. 1.
See get along, def. 2.
get on in the world or company, etc. Prosper or succeed, as in Her inheritance has helped her get on in society, or Dad asked if Bill was getting on in the company. [Early 1800s]
get on with it. Move ahead, pursue one's work. For example, We've spent enough time talking about it; now let's get on with it. [Early 1800s]
get on for. Advance toward an age, amount, time, and so on. For example, It's getting on for noon, so we'd better eat lunch. This usage is often put in the participial form, getting on for. [Mid-1800]