恵

being too clever (for one's own good); getting done in by one's own cleverness

general preferential duties; general preferential taxes

Beyrich's slit shell (species of sea snail, Pleurotomaria beyrichii)

broadnose sevengill shark (Notorynchus cepedianus, species of circumglobal cow shark with 7 gill slits)

Law

period of grace (e.g. in which merchant vessels are allowed to leave a belligerent nation's port after an outbreak of war)

Sei Shonagon chie-no-ita; Japanese puzzle similar to tangram

dissection puzzle (tangram, Sei Shonagon chie-no-ita, etc.)

reciprocity; reciprocity principle

hint; suggestion