• have several irons in the fire

• fire away

• fighting fit

• baptism of fire

• find your bearings

• add fuel to the fire

• like a house on fire

• put up a good fight

• a firebrand

• final nail in the coffin

• fight shy of

• set the heather on fire

• go through it with a fine-toothed comb

• find it in one's heart to do it

• fight it out

• the fat is in the fire

• there's no smoke without fire

• suffice it to say

• fight shy of it

• finders keepers

• fine feathers make fine birds

• a bunch of fives

• find one's feet

• hang fire

• find one's own level

• open fire

• find it in one's heart

• find one's footing

• spread like wildfire

• the rank and file

• cut it fine