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Spotted in the wild:
- French hone in on Egypt crash black box signal (abs-cbn news, January 7, 2004)
- Police hone in on site: Stillman wants new station on Robbins Road (Daily News Transcript, January 31, 2005)
- “Performance-wise our Pontiac Grand Am and Kurt’s Chevrolet will be right there,” said Johnson. “We actually expect to be at the head of the pack. We started honing in on it toward the end of last season, but didn’t have enough time to produce all the parts and pieces that it takes to get the performance to where it needs to be. (motorsport.com, 2005-02-07)
- With an election in the offing and opinion polls dictating their every gesture, our political masters have honed-in on immigration as a key battle-ground. (The Scotsman, 8 Feb 2005)
Honing the blade for a surgical strike.
Listed in The American Heritage® Dictionary of the English Language (2000) without as much as a usage note, and in the BBC Skillswise Glossary, _hone in (on)_ is very likely to pass into the mainstream.
The Columbia Guide to Standard American English (1993), though, calls it an “erroneous version of _home in (on)_”.