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Thanks to everyone who responded. I got some other helpful options but this clearly rang a bell with everyone. 4 KudoZ points were awarded for this answer
What's wrong or why don't you like the simplest solution, gancho? It suits perfectly in all your examples and it has a wide and correct use (it's not just popular, it is right). I'd simply use it. :)
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Answers
1 min confidence: peer agreement (net): +13
a hook (in this context)
gancho
Explanation: common term
Peter Guest Spain Local time: 05:56 Works in field Native speaker of: English PRO pts in category: 16
Grading comment
Thanks to everyone who responded. I got some other helpful options but this clearly rang a bell with everyone.
Notes to answerer
Asker: Thanks Peter - you win the Euro vote by a convincing majority :-)