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blocker
noun
a
person
or
thing
that
stops
movement
or
progress
•
Fallen
rocks
created
a
blocker
on
the
mountain
road
.
Fallen
rocks
created
a
blocker
on
the
mountain
road
.
•
Lack
of
funding
became
the
biggest
blocker
to
finishing
the
community
center
.
Lack
of
funding
became
the
biggest
blocker
to
finishing
the
community
center
.
Formed
from
the
verb
“
block
”
+
the
agentive
suffix
“
-er
,”
first
recorded
in
English
in
the
early
19th
century
.
noun
a
player
in
sports
whose
job
is
to
stop
opponents
or
shots
•
The
right
tackle
is
the
main
blocker
protecting
the
quarterback
.
The
right
tackle
is
the
main
blocker
protecting
the
quarterback
.
•
In
volleyball
,
every
front-row
player
must
be
a
good
blocker
.
In
volleyball
,
every
front-row
player
must
be
a
good
blocker
.
Sports
sense
arose
in
early
20th-century
U
.
S
.
football
slang
,
extending
the
general
idea
of
‘
one
who
blocks
’.
noun
in
computing
or
project
management
,
a
problem
that
must
be
fixed
before
work
can
continue
•
The
missing
API
key
is
a
blocker
for
today
’
s
release
.
The
missing
API
key
is
a
blocker
for
today
’
s
release
.
•
Please
flag
any
blockers
before
the
sprint
planning
meeting
.
Please
flag
any
blockers
before
the
sprint
planning
meeting
.
Borrowed
from
general
English
“
blocker
”
and
popularized
in
software
development
jargon
in
the
late
1990s
.
noun
a
drug
that
prevents
a
chemical
action
in
the
body
,
especially
by
stopping
certain
receptors
•
The
doctor
prescribed
a
beta-blocker
to
lower
his
blood
pressure
.
The
doctor
prescribed
a
beta-blocker
to
lower
his
blood
pressure
.
•
Histamine blocker
tablets
relieved
her
allergy
symptoms
.
Histamine blocker
tablets
relieved
her
allergy
symptoms
.
Medical
use
developed
in
the
mid-20th
century
as
pharmacology
identified
drugs
that
‘
block
’
specific
receptor
sites
.