informal: relied on and regularly turned to for expert knowledge, skill, or performance
the company's go-to guy
Brown became the go-to researcher for genetic conundrums. Brad Lemley
Nowadays, one running back will get almost all of the carries, one reliever will get nearly all of the saves. And in the NBA, the evidence is mounting that "go-to guys" are scoring an ever greater proportion of the points in any particular game. Steve Hirdt
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informal: regularly or repeatedly chosen or employed for reliably good results
O'Neal's go-to move has become a soft jump hook, which he can shoot with either hand. Chris Ballard
While mozzarella may be the go-to cheese for pizza, … blue cheese … can also be great. Sam Gugino
A waitress came by and Reacher ordered his go-to breakfast, which was coffee plus a short stack of pancakes with eggs, bacon, and maple syrup. Lee Child