noun

• (UK, business) A business partnership; the name under which it trades.
• (business, economics) A business enterprise, however organized.
  "Finance is seldom romantic. But the idea of peer-to-peer lending comes close. This is an industry that brings together individual savers and lenders on online platforms.[…]Banks and credit-card firms are kept out of the picture. Talk to enough people in the field and someone is bound to mention the “democratisation of finance”."
• (slang) A criminal gang, especially based around football hooliganism.

adv

• (now rare) firmly, steadily

verb

• (transitive) To make firm or strong; fix securely.
  "Stolz said the move by ClubsNSW had only firmed his resolve to keep fighting for the right to disclose information in the public interest about money laundering in registered clubs."
• (transitive) To make compact or resistant to pressure; solidify.
• (intransitive) To become firm; stabilise.
• (intransitive) To improve after decline.