に当たって[niatatte] at the time of (ind. opportunity or situation where something should be done)
一騎当千[ikkitousen] being a match for a thousand
一指当たり[ichiyubiatari] span
一人当たり[hitoriatari] per person
一人当て[hitoriate] per person

引当[hikiate] mortgage
引当金[hikiatekin] reserves
押し当てる[oshiateru] to push (something) against
穏当[ontou] proper
過当[katou] excessive

機関[karakuri] mechanism
アナログ計算機[anarogukeisanki] analog computer
エンジン発動機[enjinhatsudouki] engine
サーボ機構[saabokikou] servomechanism
シフト演算機構[shifutoenzankikou] shift arithmetic unit

ジェット機[jettoki] jet aeroplane
弾機[hatsujou] spring (e.g. coil, leaf)
ヒグス機構[higusukikou] Higgs mechanism (physics)
プロペラ機[puroperaki] propeller-driven aircraft
圧延機[atsuenki] rolling machine

垂迹[suijaku] temporary manifestation by a buddha (in order to save people)
筆迹[hisseki] handwriting
真迹[shinseki] true autograph

事迹[jiseki] evidence
本地垂迹説[honjisuijakusetsu] manifestation theory (holding that Shinto gods are manifestations of buddhas)
迹門[shakumon] first half of the Lotus Sutra, in which the Buddha appears as a spatiotemporally restricted being