0 to make yourself continue to do what you are doing or stay where you are although it is difficult or unpleasant: --
If you can just hold on I'll go and get some help.
2 to hold something or someone firmly with your hands or arms: --
3 to wait, esp. for someone to speak: --
She’s on the other line – can you hold on?
4 to wait while someone else does something, especially when you are using the phone: --
5 to continue to do something difficult while waiting for help: --
Why on earth did you let go of the wheel? You've got to hold on all the time while the vehicle is moving.
She grabbed the door handle and held on, even when the car drove off.
Hold on! I'm not ready.