Engines and cars
electricity, phones and radio
danger
effort
other idioms
100

get into gear

get ready to start work on something

100

get your lines/wires crossed

there is a misunderstanding between you and someone

100

have a narrow escape

just manage to avoid danger or trouble

e.g. The crew had a narrow escape when the pilot made a crash landing

100

child's play

extremely easy

100

back-pedalling

beginning to say the opposite of what it said before

200

a back-seat driver

someone who's always telling you what's wrong about your driving

200

to be on the same wavelength as someone

you view the world or think in the same way as them
200

do something by the skin of your teeth

only just succeed in doing something

e.g. we won the match by the skin of our teeth

200

at a push 

probably possible, but it will be difficult

e.g. I could finish the report by Wednesday - at a push, Tuesday

200

put/ throw a spanner in the works

spoilt something, e.g. a plan, etc.)

300

put the breaks on something

to be more cautious or careful

300

blow a fuse/ gasket

you lose your temper and act and react very angrily to an event

300

cut things fine

leave yourself only just enough time to do something

e.g. I prefer getting to the station early, but Lee always cuts things fine.

300

pull your finger out

make more of an effort 

e.g. If you don't pull your finger out, you'll get the sack

300

state-of-the-art

with all the lastest/ newest features

400

tick over (e.g. things are ticking over nicely)

things are going well, working smoothly 

400

give someone a buzz

you phone them (informal)
400

rather/ too close for comfort 

so close in distance or similar in amount that you are worried or frightened 

e.g. We won the election, but the results were rather close for comfort

400

have a bash (at)

informal way of have a go

400

to be in the pipeline

being discussed but not public yet

500

let off steam

to reduce stress/ high pressure

500

go under your own steam

to go/ do something on your own

500

something sets alarm bells ring¡ng

something worries you because it is a sign that there may be a problem

e.g. The strange look she gave me set alarms bells ringing

500

by hook or by crook

using whatever methods are necessary

500

be a doddle

very easy to do

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