few and far between

a bridge too far

A step or action that is too ambitious; an act of overreaching.

as far as one knows

To the best of one's knowledge, as far as someone knows or possible information to be gathered about the topic, subject, aspect, or situation.

far and away

By a large degree or margin; greatly (used before comparative and superlative adjectives).

far be it

A disclaimer stating that something should not come to pass, or that a person would never do or think a certain thing.

far cry

A long distance, in terms of dissimilarity or difference.

far post

The goalpost furthest from where a cross is made.

go far

To attain success, especially from humble origins; achieve a great deal.

go so far as

To reach an unexpected extent in doing something.