feet first

beat feet

To run.

blink first

To be the first party in some situation to give in or back down.

cast the first stone

To act self-righteously in accusing another person, believing oneself to be blameless.

come first

To win first place in a competition.

director of first impressions

A receptionist.

drag one's feet

To procrastinate, put off; to dawdle, avoid, or make progress slowly and reluctantly.

feet of clay

In someone apparently strong and without failings, a hidden weakness which could lead to downfall.

find one's feet

To grow in confidence in a new situation as one gains experience.