used to tell someone to wait for a short time:
Hold on, I'll check in my diary.
used to say that you are confused or surprised by something that you have just heard or read and want to understand it:
Now hold on, Ed, that wasn't what we agreed at all!
to manage to stay alive or to deal with a difficult situation:
We just had to hold on until help arrived.
to hold something or someone firmly with your hands or arms:
She held on tightly to his waist.
(Cambridge Advanced Learner's Dictionary & Thesaurus からの hold on の定義 © Cambridge University Press)
to wait, esp. for someone to speak:
She’s on the other line – can you hold on?
(Cambridge Academic Content Dictionary からの hold on の定義 © Cambridge University Press)
to wait while someone else does something, especially when you are using the phone:
Can you hold on? I'll try to connect you.
Hold on, I'll be with you in a minute.
to continue to do something difficult while waiting for help:
Can you hold on for just a few more minutes? Then you can take a break.
(Cambridge ビジネス英語辞典 からの hold on の定義 © Cambridge University Press)
- Cambridge Dictionary