strap, n.² — Green’s Dictionary of Slang

strap n.²

(UK Und.) a scheme, a plan.

c.1698

B.E. Dict. Canting Crew n.p.: He Whiddles the whole Strap, c. he discovers all he knows.

hit one’s strap(s) (v.)

(Aus.) to come into form, to reach one’s potential.

1992		M. Coleman Fatty 118: ‘He never really hit his straps with us’.
2017		Adelaide Advertiser 8 Sept. 🌐 Former Queensland who looks like he’s starting to hit his strap after a couple of runs for the Darren Weir camp.
2020		https://www.the-buyer.net 27 Feb. 🌐 Not only a talented winemaker, but also globe-trotting wine judge, she has really hit her straps at the KWV Mentors Cellar.