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Synonyms for slow up
verb stick; become stuck

stall
impede
halt

decelerate
delay
detain

retard
set back
sink

slacken
hang up
slow down

Antonyms for slow up

advance

help

forward

Synonyms
verb hold, keep back; arrest

apprehend
delay
confine
jail
decelerate
hinder
retard
nab

pinch
inhibit
bust
withhold
intern
restrain
ice
mire

impede
constrain
check
reserve
bog down
hold up
pick up
pull in

put away
run in
set back
buttonhole
hang up
send up
slow down

Antonyms

liberate
aid
assist
facilitate
permit

release
free
advance
allow
forward

help
push
let go
give
offer

Synonyms
verb move slowly; delay

slow
slacken
wane
fall off
trail
decrease
falter
diminish
fail
shuffle
ebb

slouch
tarry
jelly
dawdle
procrastinate
poke
dillydally
idle
lounge
plod
tail

inch
limp
tool
stay
flag
hobble
straggle
dally
saunter
retard
trudge

linger
drag
stagger
loiter
hang back
put off
be behind
get no place fast
inch along
lose strength
drag one’s feet

Antonyms

grow
increase
enlarge
complete
hasten
hurry
raise

develop
expand
run
rise
finish
go
push

rush
advance
do
tiptoe
leave

Synonyms
verb delay, catch up in

bog down
entangle
implicate
embroil
ensnare
involve

flounder
enmesh
stick
tangle
trap
decelerate

retard
soil
detain
dirty
cling
snare

entrap
sink
set back
hang up
slow down

Antonyms

exclude
untangle
release
clean

liberate
untwist
free
let go

remove
uncomplicate

Synonyms
verb hinder, obstruct

decelerate
handicap
lessen
impede
crimp
hamper
defer
loaf
clog
fetter
reduce
down

dawdle
decrease
check
hesitate
poke
detain
delay
arrest
falter
postpone
balk
mire

baffle
flag
slacken
choke
encumber
stall
loiter
brake
bog
back off
bog down
hold back

hold up
let up
set back
shut down
take down
choke off
bring to screeching halt
close off
hang up
retardate
shut off
slow down

Antonyms

aid
assist
expedite
hasten
hurry
unblock
release
grow
increase
speed

liberate
persevere
further
help
promote
advance
forward
do
free
let go

expand
raise
strengthen
rush
allow
continue
encourage
maintain
push

Synonyms
verb delay, hinder

bog down
decelerate
defeat
detain

hold up
impede
mire
retard

reverse
slow
embog
hang up

slow down

Antonyms

advance

forward

Synonyms
verb defer, postpone

suspend
waive
freeze
prolong
put off
dismiss
scrub

drop
pigeonhole
stay
delay
sideline
table
hold

hold up
tie up
mothball
give up
prorogue
hang up
hold off

hold over
lay aside
put aside
put on back burner
put on hold
put on ice

Antonyms

carry out
go ahead

continue
go

advance
do

Synonyms
noun looseness, excess

play
room

give
slowdown

leeway
slackening

slow-up

Antonyms

stiffness
rigidity

tautness
tightness

Synonyms
noun slacking off; gradual decrease

decline
stagnation
drop
delay
strike

downturn
slackening
inactivity
slack
stoppage

freeze
arrest
retardation
falloff
drop-off

deceleration
downtrend
slow-up

Antonyms

increase
breakthrough

rise
speed-up

Usage Notes

As an adverb, slow has two forms, slow and slowly. Slowly appeared first in the 15th century; slow came into use shortly thereafter. Both are standard today in certain uses. Originally, slow was used both preceding and following the verb it modified. Today, it is used chiefly in imperative constructions with short verbs of motion (drive, run, turn, walk, etc.), and it follows the verb: Drive slow. Don’t walk so slow. This use is more common in speech than in writing, although it occurs widely on traffic and road signs. Slow also combines with present participles in forming adjectives: slow-burning; slow-moving. In this use it is standard in all varieties of speech and writing. Slowly is by far the more common form of the adverb in writing. In both speech and writing it is the usual form in preverb position (He slowly drove down the street. The couple slowly strolled into the park) and following verbs that are not imperatives (He drove slowly down the street. The couple strolled slowly through the park). See also quick, sure.