first

See:

at first at first blush at first glance at first hand at first light at first sight be carried out feet first be first among equals be first past the post be in the first flush of cast the first stone first among equals first and foremost First catch your hare First come, first served first crack at first hand first hundred years are the hardest

First impressions are the most lasting First in, best dressed first leg first of all first off first see the light of day first step is always the hardest first thing First things first firstest with the mostest get to first base give first refusal have first call on have first crack at He that would the daughter win, must with the mother first begin hindside first If at first you don't succeed If at first you don't succeed, try, try again

in the first place in the first place and in the first instance jump in with both feet know the first thing about Ladies first love at first sight Not if I see you sooner, and Not if I see you first not know the first thing about of the first water on a first-name basis play first chair see in hell before Self-preservation is the first law of nature Shoot first, ask questions later the [first etc.] rung on the ladder the first string You first