Customer Support

noun a visit or request made to someone, especially as part of an official process

verb to visit or request someone to speak or perform a task

preposition used to indicate that a particular action or event is the result of a decision or choice

• The teacher decided to call on the students one by one to answer the math problem.
• I always call on Sarah to help me with my homework because she's really smart.
• I'll call on my buddy to give me a ride to the party tonight.
• During times of trouble, we often call on our inner strength to keep going.

noun a book listing the names, addresses, and phone numbers of individuals and businesses in a specific area

• The telephone book contains a list of all the residential and business phone numbers in the area.
• I found your number in the telephone book, so I gave you a call.
• I never use the telephone book anymore, I just Google everything.
• In this digital age, the telephone book is like a relic from a bygone era.