not a word or movement (idiom); remaining calm and collected
not batting an eyelid
Definitions (粵典–words.hk)
語句
喺緊急情況下，講嘢、神態仍然同平時一樣，形容人非常鎮靜。 not revealing somebody's feelings or emotions; not turning a hair
有人打劫銀行，銀行經理不動聲色，偷偷報警。
有人打劫银行，银行经理不动声色，偷偷报警。
Someone is robbing the bank, the bank manager did not turn a hair and secretly called the cops.
Definitions (Wiktionary)
phrase, idiomatic
to maintain one's composure; to stay calm and collected; to not turn a hair; to not bat an eyelid; to not show or betray one's feelings or intentions (syn.) 不露聲色, 不露声色
一名男子偷窺女廁所 機智女子不動聲色報警擒色狼
一名男子偷窥女厕所 机智女子不动声色报警擒色狼
yī míng nán zǐ tōu kuī nǚ cè suǒ ， jī zhì nǚ zǐ bù dòng shēng sè bào jǐng qín sè láng Man caught peeping into female bathroom; quick-thinking woman kept her cool and reported it to the police; sexual predator arrested
Definitions (Kaifangcidian)
（沒有對應漢語詞彙）
Examples (None)
Cantonese
不动声色
不動聲色
Examples (粵典–words.hk)
Cantonese
有人打劫银行，银行经理不动声色，偷偷报警。
有人打劫銀行，銀行經理不動聲色，偷偷報警。
Someone is robbing the bank, the bank manager did not turn a hair and secretly called the cops.