Green’s Dictionary of Slang

bridge v.3

(Aus.) to look at something.

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[Aus] ‘Whisper All Aussie Dict.’ in Kings Cross Whisper (Sydney) xxxii 7/1: bridge: To look at something.

In phrases

bridge up (v.)

(Aus. prison) to show off; to gesture as if threatening a fight.

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[Aus]R.G. Barrett Real Thing 37: Get a couple of sheilas and go and have a blow out somewhere. Take the Rolls and bridge up a bit.
[Aus]R.G. Barrett White Shoes 65: There’d be heaps of [...] ‘it’s great to see you, old mate’ and [...] KK would bridge up in return.
[Aus]Tupper & Wortley Aus. Prison Sl. Gloss. 🌐 Bridge up. Show off (physically) or shape up as if to fight.
[Aus]D. Whish-Wilson Shore Leave 136: He bridged up ok, when threatened.