O-O is a 3 letter English word.
You can make 4 anagrams from letters in o-o (-oo).
First recorded in 1885-90, o-o is from the Hawaiian word ʿōʿō
Either he can o-o now; if not, then it is proof positive that his defence is bad.
When the mamo became rare the natives began to substitute the light yellow feathers growing under the wings of the o-o.