Sentence:  English or <WSD>pseudo-English</WSD> nicknames were liable to turn up amongst his friends—so he is found referring in 1897 to Sophia Goudstikker as 'der Puck" and in 1915 to the much-married Marianne Mitford as 'Baby Friedländer'! 
Meaning of the word marked with <WSD> tags:  Imitating the English language.