Contact, call, get in touch. It can also mean 'call out to get someone's attention'. The word is used in the Australian expression 'give (someone) a hoy'.
"I'l be working in the next room. Give us a hoy when you're finished packing these boxes."
"If you have any questions, just give me a hoy on my mobile."
"As soon as I find out more information, I'll give you a hoy."
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