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Wiktionary
hook, line and sinker

adv. (context idiomatic English) completely; ''(of belief or acceptance)'' naively or unquestioningly.

Wikipedia
Hook, Line and Sinker

The Hook, Line and Sinker are the three essential pieces of fishing tackle in angling. Also, in English language, the phrase 'to swallow something "hook, line and sinker" ' is an idiomatic expression to describe a situation where a person or group accepts wholesale and uncritically an idea or set of beliefs.

See further:

  • Hook, line and sinker, fishing equipment
  • Hook, Line and Sinker (1930 film), a slapstick comedy starring Wheeler & Woolsey
  • Hook, Line & Sinker (1969 film), a comedy starring Jerry Lewis
  • Hook, Line and Sinker (Transformers), characters in Marvel's Transformers comics
  • Hook, Line and Sinker (TV program), Australian television fishing show
Hook, Line and Sinker (1930 film)

Hook, Line and Sinker is a 1930 American Pre-Code slapstick comedy directed by Edward F. Cline from a screenplay by Ralph Spence and Tim Whelan. It was the third starring vehicle for the comedy team of Wheeler & Woolsey ( Bert Wheeler and Robert Woolsey), and also featured Dorothy Lee. It would be one of the largest financial successes for RKO Pictures in 1930.

Hook, Line and Sinker (TV program)

Hook, Line and Sinker is an Australian fishing television program, produced by HLS Productions in Hobart, Tasmania and is hosted by Nick Duigan and Andrew Hart. The program premiered in 2001 and is broadcast nationally on the Southern Cross Television network. The show is aired on Saturday afternoons and runs for 30 minutes.

The show features some light entertainment and comical behaviour from the hosts as well as serious fishing news and stories from around Australia.

The University of Tasmania presents a regular segment on the show called The Deep End. The segment features research and material from the Marine Research Laboratories at the Hobart campus and the National Centre for Marine Conservation & Resource Sustainability at the Launceston campus.