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knock
verb
-
knock
,
knocking
,
knocks
,
knocked
to
hit
a
surface
,
especially
a
door
,
to
make
a
short
sound
that
asks
someone
to
pay
attention
or
let
you
in
•
Knock
before
you
enter
,
please
.
Knock
before
you
enter
,
please
.
•
She
heard
someone
knock
loudly
on
the
front
door
during
the
storm
.
She
heard
someone
knock
loudly
on
the
front
door
during
the
storm
.
Middle
English
knoken
,
from
Old
English
cnocian
,
imitative
of
the
sharp
sound
produced
by
striking
.
noun
a
short
sharp
sound
made
when
something
hits
a
hard
surface
•
There
was
a
loud
knock
at
the
door
.
There
was
a
loud
knock
at
the
door
.
•
I
recognised
her
soft
knock
immediately
.
I
recognised
her
soft
knock
immediately
.
verb
-
knock
,
knocking
,
knocks
,
knocked
to
hit
something
or
someone
,
often
by
accident
,
causing
it
to
move
,
fall
,
or
be
damaged
•
Be
careful
not
to
knock
that
vase
off
the
table
.
Be
careful
not
to
knock
that
vase
off
the
table
.
•
The
bus
mirror
knocked
his
shoulder
as
it
passed
.
The
bus
mirror
knocked
his
shoulder
as
it
passed
.
noun
a
hit
or
blow
that
causes
slight
injury
,
damage
,
or
setback
•
He
took
a
knock
to
the
head
during
the
game
.
He
took
a
knock
to
the
head
during
the
game
.
•
The
phone
still
works
despite
a
few
knocks
.
The
phone
still
works
despite
a
few
knocks
.
verb
-
knock
,
knocking
,
knocks
,
knocked
informal
:
to
criticise
or
speak
unfavourably
about
something
or
someone
•
Don
’
t
knock
the
idea
until
you
’
ve
tried
it
.
Don
’
t
knock
the
idea
until
you
’
ve
tried
it
.
•
The
critics
knocked
the
movie
for
its
weak
plot
.
The
critics
knocked
the
movie
for
its
weak
plot
.
noun
a
sharp
repetitive
noise
from
an
engine
caused
by
improper
combustion
•
The
mechanic
said
the
engine
’
s
knock
was
due
to
low-octane
fuel
.
The
mechanic
said
the
engine
’
s
knock
was
due
to
low-octane
fuel
.
•
I
heard
a
metallic
knock
when
I
started
the
car
this
morning
.
I
heard
a
metallic
knock
when
I
started
the
car
this
morning
.
