go for it

[1] You say 'Go for it' to encourage someone to increase their efforts to achieve or win something.[INFORMAL] (자료: Collins Cobuild)

[2] (Informal) To expend all one's strength and resources toward achievement of an end or purpose.  (자료: American Heritage Dic)

[3] go for: (3) Aim or try for, especially making a vigorous effort. For example: 

• They're going for the league championship. 

This idiom is also put as "go for it", as in: 

• When Steve said he'd like to change careers, his wife told him to go for it. 

The related phrase "go for broke" means "to commit all one's available resources toward achieving a goal," as in: 

• Our competitors are going for broke to get some of our accounts. 

The first expression dates from the mid-1500s; the two colloquial variants from the first half of the 1900s. Also see all out; go out for. (자료: American Heritage Dictionary of Idioms)