Be not much cop British informal slang
If you say that something or someone is not much cop, you mean that they are not of high quality, not useful or not very good.
I am not much cop at swimming.
This sequel of the book is not much cop.
Being not much cop as a flight attendant, so she ditched this job.
To be much less good than someone or something
The verb " be" must be conjugated according to its tense.
Cop was a slang term for "value" or "use" in the early twentieth century.
White lie
Ken: Yesterday I lost the watch that my girlfriend presented to me. Should I tell her this thing?
Lily: Certainly Not! Your girlfriend will be angry with you. Children and fools tell the truth.