The initial idioms of the letter H

harder than the back of God's head	hardhat
hardheaded	hard line
hardliner	hard-luck story
hardly	hardly dry behind the ears
hardly earth-shattering	hardly ever
exchange no more than	hardly have time to breathe
hardly have time to think	hard-nosed
hard-on	hard
hardware	hare
hark back	hark back to
hark	harm
harm a hair on head	harmonize with
harness an animal up	harness to
harness	harp away at (someone or something)
harp on	harp on one string