警けい鐘しょうを鳴ならす

Meanings

1

expression, godan verb (-su)

ring an alarm bell

Literal meaning: physically sounding a bell as a warning signal.

2

expression, godan verb (-su)

sound a warning; raise the alarm; send a wake-up call

idiomatic expression

Figurative use: to issue a strong warning about a danger or problem, often in public discourse.

警けい告こくする
警告する is a general verb for warning someone directly, while 警鐘を鳴らす is a more vivid, often public or metaphorical expression.
注ちゅう意いを促うながす
注意を促す means to call attention or urge caution, which is similar but less forceful than 警鐘を鳴らす, which implies a stronger, alarm-like warning.

Compound of 警鐘 (alarm bell) + を + 鳴らす (to ring). The figurative sense extends the literal act of ringing a bell to any strong public warning.