(theology, eschatology) a mark on the person of worshippers of the Antichrist; without the mark one cannot buy or sell / (nautical, slang, archaic) The patches on the lapels of a midshipman's jacket.

simple past tense and past participle of make head or tail of

present participle of make head or tail of

simple past tense and past participle of make certain

present participle of make certain

(euphemistic) pornography.

present participle of corner the market

simple past tense and past participle of corner the market

Third-person singular simple present indicative form of corner the market

To behave in a rude, ill-mannered way.