(transitive, UK, informal) To improve, optimize, or maximize the attributes of (something).
The mech side of this is a tinkerer's paradise, allowing you to spec up your squad's weapons and armour to your heart's content, at least once you have built up the confidence to move away from stock setups.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
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