better off   (境况)更好一些 (如:更富有, 更舒适等)
for the better   好转, 改善
get the better of...   打败, 战胜, 占上风
had better   最好
have the better of...   打败, 战胜, 占上风
know better   明白事理
know better than (to) do sth   明白事理而不至于(做某事), 懂得不宜做某事
think better of (doing) sth   决定不..., 改变主意(不做某事)