Binomials

Tried and tested

something that has been used before and proven to be reliable or effective

Chalk and cheese

two things that are completely different

Trial and error

learning or solving something by trying different methods and making mistakes until you find what works

Cut and dried

already decided, clear, cant be changed

Touch and go

uncertain or risky

Fits and starts

happening irregularly

Ins and outs

all the details of something

By and large

generally speaking, on the whole

Black and white

very clear and easy to understand, with no confusion or doubt

Give and take

situation of compromise