If you meant:
"To let 'O'" as in a word or idiom starting with O:
There’s no idiom or phrase called "to let o", but here are related ideas:
-
"To let out" → means to release or allow something/someone to go out.
Example: The teacher let the students out early. -
"To let off" → means to excuse someone from punishment or allow to leave.
Example: He was let off with a warning. -
"To let go" → already discussed earlier (means to release, emotionally or physically).
✅ If you're referring to something else (like):
-
“To let office”
-
“To let on”
-
“To let over”
Then please confirm the full keyword or phrase.