Antonyms:

accelerate, quicken, speed, speed up

move faster

types:

show 8 types...

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slow, slow down

cause to proceed more slowly

delay, detain, hold up

cause to be slowed down or delayed

bog, bog down

cause to slow down or get stuck

clog, constipate

impede with a clog or as if with a clog

stonewall

engage in delaying tactics or refuse to cooperate

catch

delay or hold up; prevent from proceeding on schedule or as planned

stall

deliberately delay an event or action

buy time

act so as to delay an event or action in order to gain an advantage

type of:

decrease, diminish, fall, lessen

decrease in size, extent, or range

type of:

weaken

become weaker

types:

bog, bog down

cause to slow down or get stuck

clog, constipate

impede with a clog or as if with a clog

type of:

decelerate, retard, slow, slow down

lose velocity; move more slowly