This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. Present participle of slack.

n. the evasion of work or duty

""How do you like Criterion's paces?" he said, after they had entered the park and were slacking from a canter to a walk."

lax    standing    negligent    slacken   

slacked    slackely    slacking    slackness    slacks   

neglect    weaken    minify    lessen    decrease    loosen    loose    débris    rubble    dust   

slack in stays    slack-water haul    slack barrel    slack twist    to slack out    to slack off    a slack hand    to slack away    to slack up    slack water   

slack-jawed   

culm    inactive    tardy    dull    abated    backward    relaxed    weak    slow    loose   

Adak    Black    Braque    Chirac    Jack    Jacques    Lak    Mac    Mack    Macke   

pant    Jeans    jacket    sock    skirt    breech    blazer    vest    underwear    jumpsuit