Phrasal Verb: Fasten onto
Meaning: Follow someone closely, normally when they don't want your company
Example: He FASTENED ONTO the minister on his visit and asked him repeatedly about the scandal.
Meaning: Give attention to something that confirms your beliefs
Example: They FASTEN ONTO any figures that they think can support their case.
Other Phrasal Verbs
We have 4 phrasal verbs with 'FASTEN'