司马昭之心路人皆知

lit. Sima Zhao's intentions are obvious to everyone (idiom) / fig. an open secret

surname Si

to take charge of / to manage / department (under a ministry)

Minister of War (official title in pre-Han Chinese states) / two-character surname Sima

surname Ma / abbr. for Malaysia 馬來西亞|马来西亚[Ma3 lai2 xi1 ya4]

horse / CL:匹[pi3] / horse or cavalry piece in Chinese chess / knight in Western chess

Sima Zhao (211-265), military general and statesman of Cao Wei 曹魏[Cao2 Wei4]

bright / clear / manifest / to show clearly

(possessive particle, literary equivalent of 的[de5]) / him / her / it

heart / mind / intention / center / core / CL:顆|颗[ke1],個|个[ge4]

scheme / artifice / tolerance / intention / motive / train of thought / brains / wit / ideas

surname Lu

road / CL:條|条[tiao2] / journey / route / line (bus etc) / sort; kind

passer-by / stranger

person; people / CL:個|个[ge4],位[wei4]

all / each and every / in all cases

understood by everyone (idiom); well known / a household name

to know / to be aware