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同義字
underground
Something done secretly, so nobody knows about it.
同義字
surreptitious
Something done secretly, so nobody knows about it.
同義字
hugger-mugger
Something done secretly, so nobody knows about it.
同義字
cloak-and-dagger
Something done secretly, so nobody knows about it.
同義字
clandestine
Something done secretly, so nobody knows about it.
同義字
hole-and-corner
Something done secretly, so nobody knows about it.
同義字
secret
Something done secretly, so nobody knows about it.
同義字
undercover
Something done secretly, so nobody knows about it.
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