mum
noun
adj
mʌm
noun
1
mother
[英] 妈妈;
BrE AmE
2
mum’s the word
used
to
tell
someone
that
they
must
not
tell
other
people
about
a
secret
[口] 别声张，不要讲出去，要保密
spoken
adj
3
keep mum
to
not
tell
anyone
about
a
secret
[非正式] 别声张，要保密
informal