to sell / promote something at a higher value than it is supposed to be; it describes people who become difficult / picky, or want more benefits, because they suddenly become more popular
one should be resolute (harden their hearts) and be willing to let go once they have decided on something (especially when compelled by circumstances) and not allow themselves any chance to renege
(slang) literally 'the leftover sugar cane; the leftovers that no one wants after all the good ones has been picked, often used in a derogatory way to refer to refer to women who are 'the leftover women' that no man wants
(Phrasal verb) to offer a great bargain; to give away or sell something at a low cost in order to attract business; to offer people huge benefits or do special favours for others; a huge disposal of goods at reduced prices; a huge markdown sale