一臂[ippi] (a) (helping) hand
三面六臂[sanmenroppi] rush of business
八面六臂[hachimenroppi] competent in all fields
猿臂[enpi] long, protruding elbows (like those of a monkey)

猿臂を伸ばす[enpiwonobasu] to stretch one's arms
半臂[hanpi] short-sleeved (or sleeveless) undergarment worn by aristocratic men
半臂の緒[hanpinoo] decorative gauze strap that hangs from the front left side of the kohimo when tying closed one's hanpi
猿臂打ち[enpiuchi] elbow strike (karate)

一念発起[ichinenhokki] being resolved to (do something)
引き起す[hikiokosu] to cause
縁起[engi] omen
喚起[kanki] arousal
起きる[okiru] to get up

起上る[okiagaru] to rise
起す[okosu] to raise
起こり得る[okoriuru] to be possible to occur
起る[okoru] to occur
起つ[tatsu] to rise up