Sell out phrasal verb informal
Used to say that you betray someone for your personal benefit.
The employees thought that their boss had sold them out.
To be entirely sold.
The comedy tickets were completely sold out yesterday.
To renounce or betray one's stated ideas or cause, especially for financial or personal gain.
The board of directors felt that their assistants had sold out when publishing their diaries.
A product's feature that likely to make people want to buy it.
Take care of or assist someone who are untrustworthy, deceitful, or ungrateful
If you say someone sells the pass, you mean that he betrays his supporter, comrades, and allies.
To sell something at auction.
To sell or part with a very precious resource for a rapid and immediate gain or benefit, rather than keeping onto it for future use or to increase its worth.
The verb "sell" should be conjugated according to its tense.
Children or adults often say this phrase to get their friends to join in something, especially to jump into a swimming pool (pond, lake, etc.)
“Last one in is a rotten egg!” yelled Jane, jumping into the pool.