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."