Idioms 1-3

racking my brains

I’ve been thinking hard

out of the blue

unexpectedly/suddenly without warning

took the words right out of my mouth

said exactly what I was going to say

rings a bell

sounds familiar

see eye to eye

agree

on the double

fast/quickly (speed)

in no time flat

quickly (time)

I've lost my train of thought

I forgot the idea I was talking about

just in the nick of time

at the last possible second

it's high time

it's long overdue (that)

put your finger on it

given exactly the right answer

heard it through the grapevine

heard a rumour (unofficial sources)

on the same wave-length

having the same sort of ideas

once in a blue moon

rarely

knows it like the back of his hand

knows it extremely well

slipped my mind

escaped my memory/I forgot it

are over my head

are too difficult for me

beats me

I don't understand it

for the time being

temporarily/for a short time

I haven't got a clue

I have absolutely no idea/I have no answer

put two and two together

make a deduction from the evidence

knows the ropes

knows all aspects of the job/has a lot of knowledge

can't make heads or tails of

I can't understand them

straight from the horse's mouth

from the authoritative source

don't know which end is up

am totally confused

in the long run

in the end/in the final result

on the tip of my tongue

something I can almost remember

every now and then

from time to time/sometimes

couldn't get a word in edgewise

I didn't have a chance to say anything

right off the bat

without delay/immediately