The plum tree sacrifices itself for the peach tree-Sacrifice oneself for another person
This idiom comes from a old folk song. the last two stanzas go like this:
One family has five brothers, all serving to a minister as attendants. Every five days, they go back home for a reunion, decorating their horses and garments with shining gold. They vie with each other for ostentation and extravagance, attracting crowds of onlookers along the road.
Now there is a peach tree by a well, and a plum tree next to it. When worms come to gnaw at the root of the peach tree, the plum tree invites them to gnaw at its own root. Finally, the plum dies, ossified.
Even trees know how to sacrifice for other trees, why can't brothers do the same?
During the Warring States Period (475-221BC), there was a man called Yue Yangzi in State Yue. One day he saw a piece of gold on the road and picked it up. He took it home and gave it to his wife. But his wife was not happy. The virtuous woman said, "I hear that a man of morality doesn't drink a thief's water and a man of probity refuses to accept alms. What do you think of the action of picking up another's lost valuable and possessing it for one's own?"
Yue Yangzi, feeling ashamed, sent the gold back to where he found it.
the next year, Yue Yangzi felt that he should go out and visit scholars to enrich his knowledge. So he set off.
A year later, he came back home suddenly.
"Why have you returned?" asked his wife in surprise, "You've only spent one year studying with scholars."
"I come back because I missed you very much."
Without saying anything, his wife took a pair of scissors and went to the loom at which she had worked. Pointing at the half done brocade, she proclaimed : "This brocade is woven from the finest silk. I wove one strand after another to produce the brocade. Now if I cut it, all my previous work will be wasted. It's the same with your studies. You can acquire knowledge only through diligence. Now, you've stopped halfway. Isn't it the same as cutting the brocade on the loom?"
Yue Yangzi was moved by what she said. He again left home to visit scholars. Several years later he became a learned man.
During the Warring States Period (475-221BC), the King of the State of Qi was very fond of listening to yu ensembles. He often got together 300 yu players to form a grand music. The king treated his musician very well. A man named Nanguo heard about that and he managed to become a member of the band, even though he wan not good at playing the instrument at all. Whenever the band played for the king, Nanguo just stood in the line and pretended to play. Nobody realized he was making no sound at all. As a result, he enjoyed his treatment just as the other musician did. When the king died, his son became the new ruler who also liked the music played on the yu. However, he preferred solos so that he ordered the musicians to play the yu one by one. Therefore, Nanguo had to run out of the palace.
the idiom "Be there just to make up the number" is used to mock someone who passes for a specialist. You can also hear people saying it about themselves to show their modesty.