toward or in the direction of; used to indicate the physical direction of an action or movement

the front part of the head from the forehead to the chin

(suffix) on; in; at; on the surface of; used after a noun to indicate a location, scope, or aspect

to stick; to paste; to post online; to glue something flat onto a surface

gold; the chemical element Au; specifically 金子 jīn​zi or 黄金 huáng​jīn