How to say "strengthen" in Japanese

• 固めるかためるJLPT N1approx.Common
  ichidan verb, transitive verbCovers 'strengthen' in the sense of making something firm or solid: its core senses are to harden and to solidify, so its strengthening is consolidation — hardening a soft substance, or making a foundation or position solid and secure.
• 強めるつよめるJLPT N1approx.Common
  ichidan verb, transitive verbUse this when strengthening means making something stronger or more intense; it also means to emphasize, so it fits strengthening things like emphasis or forcefulness rather than making anything physically hard or solid.
  フロントローラーのスラスト角かくは２度ど、多分たぶんレース時じにはもう少すこし角度かくどを強つよめる予定よていです。↗

  The front-roller thrust angle is 2 degrees, probably there were plans to strengthen that angle a little when racing.

Choose 「固める」 when 'strengthen' means making something hard, solid, or firm; choose 「強める」 when it means making something stronger or more intense, including the sense of emphasizing something.

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

• 固めるかためるto harden
• 強めるつよめるto strengthen
• 確かなものにするたしかなものにするto strengthen
• 厳にするげんにするto strengthen
• 伸ばすのばすto strengthen