‘as much use as a chocolate teapot’
Something is on the tip of my tongue
I can’t remember the name of something/someone but I think I will remember it soon
the crack of dawn
Very early in the morning
have something up your sleeve
Have a secret plan or advantage which can be used if necessary
do the donkey work
Do the hard and boring part of a job or task
a rule of thumb
A helpful, accurate guide which is based on practice not on theory.
‘by and large’
In general; when everything is considered.
‘get your skates on’ (informal, British English)
= Hurry up