sì
to watch
to wait
to examine
to spy
sì jī
to wait for an opportunity
to watch for one's chance
sì fú
servo (small electric motor)
computer server
sì xì
to wait for the opportunity
guān xìn sì xì
lit. to look for holes, and observe gaps (idiom); to search out one's opponent's weak points
to look for the Achilles heel
kuī sì
to spy upon
to lie in wait for (an opportunity)