• blind spot

• scraping the bottom of the barrel

• like father like son

• be in the melting-pot

• red hot

• a pot-boiler

• not on your life

• a hot potato

• not to be in the same street as it

• not to know the first thing about it

• I would not put it past him to do it

• at a rate of knots

• on the dot of

• I should think so not

• a hot line

• not a sausage

• not all there

• in the hot seat

• not to have a leg to stand on

• from the bottom of one's heart

• on the trot

• like hot cakes

• not quite right in the head

• go to pot

• a high spot

• scot-free

• not to turn a hair

• not the word for it

• a pot-shot

• there is not much fear of it

• like a hen on a hot griddle