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Longman Dictionary of Contemporary English
meal ticket
noun
EXAMPLES FROM OTHER ENTRIES
▪ My M.B.A. has not been the meal ticket I had hoped.
EXAMPLES FROM CORPUS
▪ For much of Pennington's working life, Shakespeare has been his mission and his meal ticket.
▪ It's amazing what some men will do for a meal ticket.
▪ It only became a moot point because David was a meal ticket for so many people.
▪ There were times when he suspected he was just a meal ticket to her.
Wiktionary
meal ticket

n. 1 A ticket or voucher that can be exchanged for food. 2 (context idiomatic English) Someone or something that provides income or livelihood, especially as an exploited source.

WordNet
meal ticket
  1. n. a source of income or livelihood

  2. coupon redeemable at a restaurant and entitling the holder to a meal [syn: luncheon voucher]

Wikipedia
Meal Ticket

Meal Ticket were a country rock band that played the London pub circuit in the 1970s. Rick Jones, a Canadian-born performer known for his television appearances on Play School and Fingerbobs, wrote many of their songs. The band performed the theme to the BBC's Play For Today episodes, The Flipside of Dominick Hide (1980) and Another Flip for Dominick, entitled "You'd Better Believe It Babe". The band released three albums; Code Of The Road (1977), Three Times A Day (1977) and Take Away in 1978.

Usage examples of "meal ticket".

Very few of them seem to have much interest in why Jimmy wants to be president, or even in what he might do after he wins: their job and their meal ticket is to put Jimmy Carter in the White House, that is all they know and all they need to know -- and so far they are doing their job pretty well.

He didn't want to be anyone's meal ticket, or meal, for that matter.

It was hardly the kind of trinket that a petty thief could peddle for a meal ticket, and professional jewel thieves - big operators - would have made a bigger haul.