explain

verb

1
serve as a reason or cause or justification of
Your need to sleep late does not excuse your late arrival at work
Her recent divorce may explain her reluctance to date again
2
make plain and comprehensible
He explained the laws of physics to his students
3
define
The committee explained their plan for fund-raising to the Dean

Also useful for “explain”:Scrabble— High-value letters — see what it scores