For the life of (someone)
Even if one's life were threatened (used with a negative and usually used when trying to remember something).For the life of me I could not... Read more →
For the heck/hell of it
Just for fun.We went to the river to throw stones, just for the heck of it.
For the good of (someone or something)
For the benefit of someone or something.They added the physical fitness class to the school curriculum for the good of the students.
For the duration (of something)
For the whole time that something continues.We had to use the outside classroom for the duration of the semester.
For the birds
Something that you do not like, something that is not to be taken seriously.Getting up early every morning is for the birds.
For the better
An improvement.It was for the better that the old hospital was closed down.
For the asking
On request, by asking.We can get a free ticket to the concert for the asking.
For that matter
About something, with regard to something."I do not want to go shopping with you, and for that matter, I do not want to go anywhere with you."
For sure
Without doubt, certainly, surely.I will go to the movie with you for sure next week.
For once
Only one time.For once, my friend listened to what I was saying. Usually he ignores me.