Could you hold please? I'll check to see if he's available.

• You have called a company to talk to someone.
• The receptionist has asked you your name and you have told her your name.
• S/he will then say: Could you hold, please? Hold means wait.
• For some reason, we only use hold on the telephone.
• In any other situation we can say: 'hold on.' (It means wait.)
• Could you hold, please? means could you wait, please?
• I'll check to see means: I'll find out / I will call him and see...
• If he's available - if he's here / able to speak to you.

This sentence is an example of requests, telephones, business.