Click Define by HalfToast

Click Define turns every word on the web into a quick lookup. Just double-click, no shortcuts, no menus, no leaving the page.

Features

• Double-click any word to open a small popup with its definition.
• Hundreds of languages via Wiktionary. When a word exists in multiple languages, a dropdown lets you pick which one to view.
• Pronunciation with IPA and an audio button (English).
• Synonyms and antonyms as clickable chips; click one to look it up; a back button returns to the previous word.
• Smart fallbacks automatically resolves "running" → "run", "boxes" → "box", "happily" → "happy", and similar word forms.
• Light and dark mode matched to your system theme.
• Customizable toggle pronunciation, synonyms, antonyms, examples, audio auto-play, and more from the settings page.
• Privacy-first only the word you double-click is sent to public dictionary APIs. Page content, browsing history, and personal data are never collected or transmitted.

How it works

When you double-click a word, Click Define queries:
- Wiktionary for multilingual definitions
- Free Dictionary API for pronunciation and audio
- Datamuse for thesaurus data

No accounts, no API keys, no tracking.

Press Esc or click outside the popup to dismiss it.