teeth
to do something by the skin of your teeth
ring
to set alarm bells ringing, to ring a bell, (not) to ring true
hand(s)
to take your life into your own hands, your life is in somebody's else's hands, to be caught red-handed
thread
to hang by a thread
knife
on a knife edge
way
to go out of your way, in a matter-of-fact way, to pay your own way
hook
by hook or by crook
finger
to pull your finger out, to have green fingers
mind
to speak your mind, to come/spring to mind, to slip your mind, to bear something in mind
memory
to commit something to memory, to take a trip/stroll down memory lane, to jog someone's memory, within living memory
word(s)
to be lost for words, to get a word in edgeways, word for word
small
small talk, a small fortune, in small doses
head
to do a head count, to go to your head, over your head, a wise head on young shoulders, to keep your head, etc.
brick wall
to come up against a brick wall, to bang your head against a brick wall
light
to throw/shed light on, to give something the green light
red
red tape, a red herring, red-handed, in the red
