to hint; to suggest; hint; suggestion

to assassinate

secret signal; password; countersign

in the dark; in secret; on the sly; surreptitiously

to be secretly in love with

shadow; umbra

to plot against

secret place

dark; dim

(physics) dark matter

to hint at; to imply; sth hidden

secretly; inwardly; on the sly

code word

dark; dim (light); dull (color); drab; (fig.) gloomy; bleak

submerged reef (rock)

inwardly; to oneself; secretly

to hide; to conceal

hidden loss (finance)

blind shaft; winze

internal injury; invisible damage

to agree implicitly; of one mind; views coincide without a word exchanged

to imply; to suggest; to connote; implicit

hidden sentry post

hidden smile; smirk; to rejoice covertly; secret satisfaction concerning one's evil plans

metaphor

concealed weapon

secretly; inwardly; on the sly

bunker

unlicensed (unregistered) prostitute

darkroom

to kill secretly; to stab in the back

think to oneself

(photography) darkroom

hidden snap fastener (concealed behind a flap on a garment)

secret agent; detective

obscure; remaining unenlightened

secretly; inwardly

submerged piles installed to prevent the passage of boats; (fig.) informer; spy

submerged sandbank; submerged coral islet

sewer; underground drainage channel

underground river

undercurrent

underground water channel; covered ditch; culvert

dull (complexion)

hidden shoal

undercurrent

sealed pot calcination (TCM)

to be secretly delighted

axillary furuncle; armpit boil