扂 diam7

diam7 扂 is explained  as diam7 zêⁿ6 扂靜｜扂静  which means an1jing4 安靜｜安静 – quiet, peaceful, calm, tranquil

The second explanation for diam7 扂 is an1ran2 安然 - peacefully, at rest, safely or tan3ran2 坦然 – which means calm, undisturbed

There is an idiom 

扂風靜浪｜扂风静浪

diam7 huang1 zêⁿ6 lang6

扂風靜浪 diam7 huang1 zêⁿ6 lang6

The Mandarin equivalent of this idiom is 風平浪靜｜风平浪静 - an idiom which means a tranquil environment; all is quiet; a dead calm and the literal meaning is still breeze; quiet waves

Another use of this diam7 扂 character is

i1 gai7 nang5 diam7 diam7 

伊個人扂扂｜ 伊个人扂扂

文靜得很

and the Mandarin direct translation is 她文靜得很｜她文静得很

which means "She is very quiet."