Sentence:  He had now <WSD>disembarrassed</WSD> himself of his riding-dress, and walking up to his daughter, he undid the fastening of her mask. 
Meaning of the word marked with <WSD> tags:  To get (someone) out of a difficult or embarrassing situation; to free (someone) from the embarrassment ("of" a situation); to relieve (someone "of" a burden, item of clothing, etc.) ("often used reflexively").