spokenespecially British Englishused to be polite when someone has thanked you or asked you to do something:
'Would you mind helping me with my suitcase?' 'Not at all.'
not the sharpest tool in the box/shed
alsonot the brightest crayon in the box, not the brightest bulb on the Christmas treeinformalused to say that someone is not very intelligent or is not able to learn things quickly or easily - used humorously
spokenused, especially by young people, to say that you really mean the opposite of what you have just said:
I really enjoy spending my day working here - not!
! Do not use another negative word (no, nothing, nobody, never etc) withnot.Useany, anything, anybody, everetc:I haven't got any (NOT haven't got no) money.|I didn't know anybody (NOT didn't know nobody).