What is an idiom?

But self-seeking, tooth for tooth, eye for eye with yin deficiency, muddling along, mending after the sheep is dead, running over the duck's back, making mistakes, leading to self-blame,

Concealing decoration, demanding more than dedication, exaggerating the truth, losing face, changing times, worrying too much, not doing too much, talking too much,

A hundred generations of passers-by, innocence, gentleman's fault, fools make mistakes, retreat, repair, cross the bridge, remove the bridge, avoid decoration, overcorrect, decorate without repair, repair merit, shop three times and four times, delay, be too honest, after a storm comes a calm, change for the better, geese leave a sound,

Overexaggerating, overcorrecting, thinking behind closed doors, ignoring what has been written, knowing that what has been done must be changed, hiding, preaching beauty, over-correcting, over-judging, over-saving, over-chewing, over-whitewashing, excessive energy, kicking down the ladder, process control, things have changed,

Too much prosperity will lead to decline, too little light will pass, too much exercise will pass, too much beauty will be changed, too much saving will make geese fly in the sky, too much blue will turn green, and too many things will pass.