Singe tells you what a word means, right where you read it.
Highlight a term. Hold Left Control. Its three most relevant meanings appear over it. Let go, and they are gone.
Everything runs on your Mac: 735,000 terms from Wiktionary and your Mac’s own dictionary, ranked by what you looked up before. No account, no cloud. Nothing you look up ever leaves the machine.
zsh <(gh api -H "Accept: application/vnd.github.raw" repos/TrenchStrAvy/singe/contents/install.sh)
macOS 13 or later and the Xcode Command Line Tools. The installer builds Singe, downloads the term index (about 53 MB) and opens it. Turn Singe on once in System Settings → Privacy & Security → Accessibility, then highlight a word in any app and hold Left Control.