Sentence:  The last obstacle in Mrs. Geraghty 's globe-girdling trip was smoothed out when a representative of Syria called upon her to <WSD>explain</WSD> that his brother would meet her at the border of that country - so newly separated from Egypt and the United Arab Republic that she had n't been able to obtain a visa . 
Meaning of the word marked with <WSD> tags:  make plain and comprehensible