wooden pile or stake driven into the ground for support, tethering, or marking

pile driver (machinery)

boundary marker; boundary post; boundary pillar

to drive piles into the ground (for a building's foundation)

the architectural base or foundation structure used to support a pier or bridge

(marking) stake

mooring bollard

It is better to destroy ten temples than to break up a single marriage; an idiom emphasizing the sanctity of marriage and the importance of not interfering in a relationship.

a trivial matter; a piece of cake

a hidden informer, secret agent, or lookout planted within an organization

each and every one

(Tw) to buy off influential local figures (in an election, a call for tenders etc)

foundation piles