To communicate with someone. Example: I'm trying to get ahold of everyone to tell them the party is tomorrow. To obtain something- get hold of something. Example: I finally got ahold of that book you said I should read. http://idioms.thefreedictionary.com/get+ahold+of

keep

"i'll let you know if i can get a hold of Calvin" .- what is the meaning of "get a hold of " in this sentence?