to seclude oneself / to be filled with... / to be stuffy, to be muffled

Alternative spelling of 引きこもり: hikikomori

basketball

A kagome lattice; an arrangement of laths composed of interlaced triangles such that each point where two laths cross has four neighboring points. Although called a lattice, it is more closely related to trihexagonal tiling than to a mathematical lattice.

cradle (oscillating bed for a baby)

automaton clock, marionette clock

mechanical doll

Synonym of 黄昏 (tasogare, “dusk; twilight”) / Synonym of 黄昏時 (tasogaredoki, “dusk; twilight”)

polyarchy

(philosophy) Mohism