How to say "collateral" in Japanese

• 担保たんぽCommon
  nounThe core word for 'collateral' in the financial and legal sense: property or assets pledged as security for a loan or debt. Use this when talking about mortgages, borrowing, or guarantees.
  家いえを担保たんぽにお金かねを借かりよう。↗

  We'll use the house as collateral so we can borrow some money.
• 副ふくCommon
  noun, prefixReally a prefix or noun meaning 'sub-', 'vice-', or 'associate' (as in deputy positions). Its connection to 'collateral' is only the marginal 'secondary' idea, so it is seldom the word you want for collateral in the security sense.
• 付帯ふたいCommon
  suru verb, intransitive verb, no-adjectiveCovers 'collateral' in the sense of incidental or ancillary — something secondary attached to a main thing, as in ancillary or accessory matters. Not used for pledged security.
• 見返りみかえりCommon
  nounMeans something given or received in return; in financial contexts it can mean collateral or security backing an obligation. Choose it when the emphasis is on reciprocity or what stands behind a deal.

For financial or legal security for a loan use 担保; for something given in return use 「見返り」; 付帯 covers the 'ancillary' sense; 副 is really a prefix and seldom means 'collateral'.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 担保たんぽsecurity
• 副ふくassistant
• 付帯ふたいincidental
• 見返り物資みかえりぶっしcollateral (goods)
• 見返り資金みかえりしきんcollateral (money)
• 担保物件たんぽぶっけんcollateral
• 借金のカタしゃっきんのカタsecurity for a loan
• 見返りみかえりcollateral
• 形かたsecurity