1	一差二错	in case of a mistake or a mishap
2	一唱一和	(said of two persons on the same side of an argument,etc.)one echoes the other
3	一筹莫展	be at a loss what to do
4	一触即发	collapse at the first encounter
5	一触即发	imminent crisis
6	一蹴而就	reach one’s aim in one move
7	一刀两断	sever relations with one stroke
8	一帆风顺	proceed smoothly without a hitch
9	一饭千金	reward a benefactor handsomely for past help or favor
10	一改故辙	change one’s old ways
11	一概而论	treat matters in an undiscriminating manner
12	一干二净	thoroughly or completely
13	一鼓作气	(of a challenge,difficult task etc.)brace oneself
14	一国三公	too many leader in a country or organization
15	一哄而散	disperse or break up in a hubbub
16	一呼百诺	have hundreds of attendants at one’s beck and call
17	一呼百应	ready to go into action in their hundreds
18	一挥而就	(of writing or painting)finish very quickly
19	一见倾心	love at first sight
20	一见如故	feel like an old friends at first sight
21	一见如故	feel like old friends at the first meeting
22	一见钟情	fall in love at first sight
23	一举成名	become famous overnight
24	一举两得	attain two objectives or gian two advantages by a single move
25	一举一动	every movement and every action-one’s behavior
26	一蹶不振	unable to recover after a set-back
27	一刻千金	every minute is precious
28	一刻千金	Time is money.
29	一孔之见	a very limited outlook
30	一劳永逸	make a great effort to accomplish something once and for all to save future trouble
31	一了百了	when the key issue is solved,the solution of the whole problem will be expedited
32	一路福星	may a lucky star follow you on you journey
33	一落千丈	(said of prestige,fortune,etc.)suffer a drastic decline
34	一马当先	be the first to take the lead
35	一面之词	a one-sided statement
36	一面之交	a nodding acquaintance
37	一面之缘	having met once only(as ordained by fate)
38	一瞑不视	to die
39	一模一样	be exactly alike
40	一木难支	one person alone cannot save the situation

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