| Definition -
A participle regarded as being joined grammatically with a preceding noun or pronoun.
Note: Some consider this a usage error. They feel that the preceding noun or pronoun should use the possessive apostrophe or the possessive case to distinguish it from the participial phrase that follows.
Example - I objected to him drinking so much. (fused)
I objected to his drinking so much. (unfused)
Oxford English Dictionary - The term's first citation is from 1906:
"The mistake is caused by certain types of sentence in which a real, not a fused participle is so used that the noun and its (unfused) participle give a sense hardly distinguishable from a possessive noun and a gerund."
(H. W. & F. G. Fowler King's Eng. ii. 119)