'maintain'はこちらの項目にも見つかりました。
英語の見出し語に対する説明:
argue
- cruise
- fall behind
- hold
- hold on
- hold onto
- hold together
- hold up
- keep
- keep alive
- keep it up
- keep smiling
- keep tidy
- keep time
- keep together
- keep track of
- keep watch
- lag behind
- preserve
- rule
- run
- running cost
- service
- social distance
- take a stand
- untenable
- uphold
- zip it