1 when you speak to someone on the telephone COLLOCATIONS 
phone call make a call give somebody a call get/receive a call take a call (=speak to someone on the phone when someone else has answered) return a call (=telephone someone who tried to telephone you earlier) local call long-distance call incoming call (=a call someone makes to you) hoax/crank call (=a call intended to trick someone) anonymous call (=from an unknown person)
telephone
[countable]
phone call make a call give somebody a call get/receive a call take a call (=speak to someone on the phone when someone else has answered) return a call (=telephone someone who tried to telephone you earlier) local call long-distance call incoming call (=a call someone makes to you) hoax/crank call (=a call intended to trick someone) anonymous call (=from an unknown person)
2 if someone such as a doctor or engineer is on call, they are ready to go and help whenever they are needed as part of their job :
Don't worry, there's a doctor on call 24 hours a day.
be on call
Don't worry, there's a doctor on call 24 hours a day.3
shout/cry
[countable]b) a shout that you make to get someone's attention
4 a visit, especially for a particular reason :
Sorry, Doctor Pugh is out on a call at the moment.
visit
[countable]
Sorry, Doctor Pugh is out on a call at the moment. pay/make a call (on somebody) (=visit someone)
5 a request or order for something or for someone to do something :
Members obediently answered the calls for funds.
request/order
[countable]
Members obediently answered the calls for funds. a call to arms (=an order for people to fight against an enemy)
6
decision
a) DS [countable] the decision made by a referee in a sports game
b) [singular] informal a decision :
make a call (=decide something)
an easy/hard call (=an easy or difficult decision)
judgement call (=a decision based on your personal judgement of a situation)
7 used for saying that not many people want a particular thing :
There isn't much call for black and white televisions these days.
there isn't much call for something
There isn't much call for black and white televisions these days.8 used to tell someone that their behaviour is wrong and unnecessary :
There's no call for that kind of language!
there is no call for something
spoken
There's no call for that kind of language!9TTA a message announced at an airport that a particular plane will soon leave :
This is the last call for flight BA872 to Moscow.
at an airport
[countable]
This is the last call for flight BA872 to Moscow.10
have first call on something
a) to have the right to be the first person to use something
b) to be the first person that you will help because they are important to you :
Her children had first call on her time.
Her children had first call on her time.11 the power that a place or way of life has to attract someone :
the call of the sea
the call of something
literary
the call of the sea