Say the wrong thing (3)
I believe the answer is:
lie
This might be a double definition.
'say' is the first definition.
The answer and definition can be both to do with communicating as well as being verbs in their base form.
Perhaps there's a link between them I don't understand?
'wrong thing' is the second definition.
The answer and definition can be both related to communication as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'the' acts as a link.
Can you help me to learn more?
(Other definitions for lie that I've seen before include "Stay hidden" , "situation" , "Whopper" , "Perjure" , "Fib in alienation" .)