under one’s breath 轻声细语
follow suit 鹦鹉学舌；学样子
gain ground 有进展
break a leg 大获全胜
turn a deaf ear 不加理睬
tit and tat 以牙还牙
that’s that 就此而已
stay the course 坚持到底
turn the clock back 时光倒转
second to none 最佳的
second thoughts 重新考虑
safe and sound 安然无恙
root and branch 完全地；连根拔除
read between the lines 明白其言外之意
over and down with 到此为止；结束
under one’s thumb 在某人支配之下
shoulder to shoulder 齐心协力地
set one’s jaw 咬紧牙关；坚持到底
see the world 见过世面；见多识广
six of one and half a dozen of the other 半斤八两