formal

to do someone's work when they are suddenly not able to do it.

Professor Collier stepped into the breach when the guest lecturer failed to turn up.

• the hand that rocks the cradle rules the world.
• the happy event
• the hard sell
• the hard stuff
• the head honcho
• the heart rules the head
• the hearts and minds of
• the hearts and minds of someone
• the heat is on
• the heavens opened
• the height of
• the height of something
• the here and now
• the high and mighty
• the highest rung on the ladder
• the high ground
• the highways and byways
• the holy of holies
• the home straight
• the home stretch
• the hot ticket
• the house from hell
• the icing on the cake
• the ins and outs
• the ins and outs of