KEEP SB ON THEIR TOES - Cambridge Learner's Dictionary AI Assistant Dictionary Translate Grammar Thesaurus +Plus Cambridge Dictionary +Plus Games Cambridge Dictionary +Plus My profile +Plus help Log out {{userName}} Cambridge Dictionary +Plus My profile +Plus help Log out Log in / Sign up English (UK) 1 ? true : false } }), searchAutoComplete.changeToLayoutContainer(); tap:AMP.setState({ stateSearch: { autocomplete: stateSearch.dataset != 'wordlists' && stateSearch.term.length 1 } })" / Learner’s Dictionary 1) ? '/autocomplete/amp?dataset=' + stateSearch.dataset + '&q=' + stateSearch.term : 'https://'" 0 && stateHdr.searchDesk ? 'pa pdd chac-sb tc-bd bw hbr-20 hbss lpt-25' : 'hdn'" {{word}} {{#beta}} Beta{{/beta}} {{#preferredDictionaries}} {{^selected}} {{name}} {{/selected}} {{/preferredDictionaries}} Meaning of keep sb on their toes – Learner’s Dictionary keep sb on their toes Add to word list Add to word list to make sure that someone gives all their attention to what they are doing and is ready for anything that might happen (Definition of keep sb on their toes from the Cambridge Learner's Dictionary © Cambridge University Press) Translations of keep sb on their toes in more languages in Polish in Turkish brać kogoś do galopu… See more tetikte tutmak, bütün dikkatini vermesini sağlamak… See more Need a translator? Get a quick, free translation! Translator tool   Browse keep at sth keep on keep on doing sth keep sb in keep sb on their toes idiom keep sb/sth from doing sth keep sth back keep sth down keep sth from sb {{#randomImageQuizHook.filename}} {{#randomImageQuizHook.isQuiz}} Test your vocabulary with our fun image quizzes Try a quiz now {{/randomImageQuizHook.isQuiz}} {{^randomImageQuizHook.isQuiz}} {{/randomImageQuizHook.isQuiz}} {{/randomImageQuizHook.filename}} Word of the Day comfort zone UK Your browser doesn't support HTML5 audio /ˈkʌm.fət ˌzəʊn/ US Your browser doesn't support HTML5 audio /ˈkʌm.fɚt ˌzoʊn/ a situation in which you feel comfortable and in which your ability and determination are not being tested About this Blog Hitting the nail on the head: idioms with ‘hit’ July 22, 2026 Read More graduation creep" layout="responsive" graduation creep" class="lc1" / New Words graduation creep July 20, 2026 More new words has been added to list To top AI Assistant Contents Learner’s DictionaryTranslations AI Assistant Facebook Instagram X © Cambridge University Press & Assessment 2026 Learn Learn Learn New Words Help In Print Word of the Year 2021 Word of the Year 2022 Word of the Year 2023 Word of the Year 2024 Word of the Year 2025 Develop Develop Develop Dictionary API Double-Click Lookup Search Widgets License Data About About About Accessibility Cambridge English Cambridge University Press & Assessment Consent Management Cookies and Privacy Corpus Terms of Use AI Terms of Use Facebook Instagram X © Cambridge University Press & Assessment 2026 {{#displayLoginPopup}} Cambridge Dictionary +Plus Learn more with +Plus Sign up for free and get access to exclusive content: Free word lists and quizzes from Cambridge Tools to create your own word lists and quizzes Word lists shared by our community of dictionary fans Sign up now or Log in Cambridge Dictionary +Plus Learn more with +Plus Create word lists and quizzes for free Sign up now or Log in {{/displayLoginPopup}} {{#displayClassicSurvey}} {{/displayClassicSurvey}} Cambridge Dictionary +Plus My profile +Plus help Log out AI Assistant Dictionary Definitions Clear explanations of natural written and spoken English English Learner’s Dictionary Essential British English Essential American English Translations Click on the arrows to change the translation direction. 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Sign up or Log in My word lists Add keep sb on their toes to one of your lists below, or create a new one. {{#verifyErrors}} {{message}} {{/verifyErrors}} {{^verifyErrors}} {{#message}} {{message}} {{/message}} {{^message}} Something went wrong. {{/message}} {{/verifyErrors}} 5 && !stateSidebarWordList.expended) ? 195 : (stateSidebarWordListItems.length * 39)" [src]="stateSidebarWordListItems" {{name}} 5 && !stateSidebarWordList.expended) ? 'hao hp lmt-25' : 'hdn'" More Go to your word lists {{#verifyErrors}} {{message}} {{/verifyErrors}} {{^verifyErrors}} {{#message}} {{message}} {{/message}} {{^message}} Something went wrong. {{/message}} {{/verifyErrors}} Tell us about this example sentence: The word in the example sentence does not match the entry word. The sentence contains offensive content. Cancel Submit Thanks! 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