A person or thing that dangles, or in grammar, a modifying phrase that doesn't clearly connect to what it's supposed to modify.
From 'dangle' plus the agentive suffix '-er' (indicating one who does something). In grammar, 'dangling modifier' became shortened to 'dangler' in the 20th century.
Grammar teachers have a special love-hate relationship with this word — a 'dangling modifier' is one of the most common mistakes students make, like 'Walking down the street, the tree looked beautiful' where 'walking' doesn't actually connect to the subject.
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