Don't lie under it (4)
I believe the answer is:
oath
This could be a double definition.
'don't' is the first definition.
Both the definition and answer are singular nouns.
Perhaps they are linked in a way I don't understand?
'lie under it' is the second definition.
The definition and answer can be both related to communication as well as being singular nouns.
I also know that 'lie under' relates to this answer.
Can you help me to learn more?
(Other definitions for oath that I've seen before include "Solemn vow" , "Sworn promise" , "Curse or solemn word" , "Commitment to tell the truth" , "One sworn" .)