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must
verb
used
to
say
that
something
is
necessary
or
very
important
•
You
must
wear
a
helmet
when
riding
a
bike
.
You
must
wear
a
helmet
when
riding
a
bike
.
•
Students
must
hand
in
their
essays
by
Friday
.
Students
must
hand
in
their
essays
by
Friday
.
Old
English
mōste
,
past
tense
of
mōtan
“
be
able
to
,
have
to
,”
later
used
in
the
present
as
a
defective
modal
verb
.
verb
used
to
say
you
believe
something
is
almost
certainly
true
•
It
must
be
cold
outside
if
the
lake
is
frozen
.
It
must
be
cold
outside
if
the
lake
is
frozen
.
•
You
must
be
Sarah's
brother
;
you
look
just
like
her
.
You
must
be
Sarah's
brother
;
you
look
just
like
her
.
Developed
from
the
same
Old
English
root
as
the
obligation
sense
,
later
extended
to
express
strong
logical
inference
.
noun
something
that
is
essential
or
highly
recommended
•
Sunscreen
is
a
travel
must
when
visiting
the
tropics
.
Sunscreen
is
a
travel
must
when
visiting
the
tropics
.
•
For
hikers
,
sturdy
boots
are
an
absolute
must
.
For
hikers
,
sturdy
boots
are
an
absolute
must
.
Figurative
extension
of
the
verb
“
must
”,
first
recorded
in
late
19th-century
English
.
noun
-
must
freshly
pressed
grape
juice
that
is
about
to
ferment
into
wine
•
The
cellar
smelled
sweet
with
the
bubbling
must
.
The
cellar
smelled
sweet
with
the
bubbling
must
.
•
Winemakers
test
the
sugar
level
of
the
must
before
fermentation
.
Winemakers
test
the
sugar
level
of
the
must
before
fermentation
.
Middle
English
,
from
Old
French
moust
,
from
Latin
mustum
“
new
wine
,”
originally
neuter
of
mustus
“
fresh
,
new
.”
adjective
smelling
of
mold
or
damp
;
musty
•
They
opened
the
old
chest
and
breathed
in
its
must
odor
.
They
opened
the
old
chest
and
breathed
in
its
must
odor
.
•
The
cellar
felt
damp
and
must
after
the
flood
.
The
cellar
felt
damp
and
must
after
the
flood
.
From
Middle
English
muste
,
related
to
‘
musty
’,
origin
uncertain
;
perhaps
from
odor
of
fermenting
must
.
