noun-modifying (irregular)
custom; custom-made; custom-built
Prenominal use before another noun, often for products, parts, designs, cars, bikes, computers, and similar items made or modified to fit a user's needs.
彼はカスタムバイクに乗っている。
He rides a custom motorcycle.
この店ではカスタム仕様のパソコンを
At this shop, you can order a PC with custom specifications.
noun, noun or participle which takes 'suru', transitive verb
customization; customize
As a noun or カスタムする verb, it means changing settings, parts, appearance, or functions to suit one's preference. カスタマイズする is often the more explicit verb, but カスタムする is common in casual product, game, IT, and hobby contexts.
スマホのホーム画面を自分好みにカスタムする。
I customize my smartphone's home screen to my liking.
このゲームはキャラクターの服装を細かくカスタムできる。
In this game, you can customize a character's outfit in detail.
noun
customs agency; customs duty
Limited trade or translation use for customs-related meanings. In ordinary Japanese, 税関 is the normal word for the government agency and 関税 for customs duty.
物流文書で「カスタム」とあれば、税関や関税を指す場合がある。
In logistics documents, カスタム may refer to customs or customs duty.